diff --git a/atom.gyp b/atom.gyp
index a56ae6139a4c..016260065ba6 100644
--- a/atom.gyp
+++ b/atom.gyp
@@ -24,6 +24,7 @@
       'atom/browser/api/lib/menu-item.coffee',
       'atom/browser/api/lib/power-monitor.coffee',
       'atom/browser/api/lib/protocol.coffee',
+      'atom/browser/api/lib/web-contents.coffee',
       'atom/browser/lib/init.coffee',
       'atom/browser/lib/objects-registry.coffee',
       'atom/browser/lib/rpc-server.coffee',
@@ -48,7 +49,6 @@
       'atom/browser/api/atom_api_app.h',
       'atom/browser/api/atom_api_auto_updater.cc',
       'atom/browser/api/atom_api_auto_updater.h',
-      'atom/browser/api/atom_api_browser_ipc.cc',
       'atom/browser/api/atom_api_dialog.cc',
       'atom/browser/api/atom_api_menu.cc',
       'atom/browser/api/atom_api_menu.h',
@@ -62,10 +62,10 @@
       'atom/browser/api/atom_api_power_monitor.h',
       'atom/browser/api/atom_api_protocol.cc',
       'atom/browser/api/atom_api_protocol.h',
+      'atom/browser/api/atom_api_web_contents.cc',
+      'atom/browser/api/atom_api_web_contents.h',
       'atom/browser/api/atom_api_window.cc',
       'atom/browser/api/atom_api_window.h',
-      'atom/browser/api/atom_browser_bindings.cc',
-      'atom/browser/api/atom_browser_bindings.h',
       'atom/browser/api/event.cc',
       'atom/browser/api/event.h',
       'atom/browser/api/event_emitter.cc',
@@ -93,8 +93,6 @@
       'atom/browser/browser_observer.h',
       'atom/browser/devtools_delegate.cc',
       'atom/browser/devtools_delegate.h',
-      'atom/browser/devtools_web_contents_observer.cc',
-      'atom/browser/devtools_web_contents_observer.h',
       'atom/browser/mac/atom_application.h',
       'atom/browser/mac/atom_application.mm',
       'atom/browser/mac/atom_application_delegate.h',
diff --git a/atom/browser/api/atom_api_browser_ipc.cc b/atom/browser/api/atom_api_browser_ipc.cc
deleted file mode 100644
index da0da3fab302..000000000000
--- a/atom/browser/api/atom_api_browser_ipc.cc
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright (c) 2013 GitHub, Inc. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "atom/common/api/api_messages.h"
-#include "atom/common/native_mate_converters/string16_converter.h"
-#include "atom/common/native_mate_converters/value_converter.h"
-#include "content/public/browser/render_view_host.h"
-#include "native_mate/dictionary.h"
-
-#include "atom/common/node_includes.h"
-
-using content::RenderViewHost;
-
-namespace {
-
-bool Send(const string16& channel, int process_id, int routing_id,
-          const base::ListValue& arguments) {
-  RenderViewHost* render_view_host(RenderViewHost::FromID(
-      process_id, routing_id));
-  if (!render_view_host) {
-    node::ThrowError("Invalid render view host");
-    return false;
-  }
-
-  return render_view_host->Send(new AtomViewMsg_Message(routing_id, channel,
-                                                        arguments));
-}
-
-void Initialize(v8::Handle<v8::Object> exports) {
-  mate::Dictionary dict(v8::Isolate::GetCurrent(), exports);
-  dict.SetMethod("send", &Send);
-}
-
-}  // namespace
-
-NODE_MODULE(atom_browser_ipc, Initialize)
diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
new file mode 100644
index 000000000000..8195a336c260
--- /dev/null
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -0,0 +1,206 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/atom_api_web_contents.h"
+
+#include "atom/common/api/api_messages.h"
+#include "atom/common/native_mate_converters/gurl_converter.h"
+#include "atom/common/native_mate_converters/string16_converter.h"
+#include "atom/common/native_mate_converters/value_converter.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/web_contents.h"
+#include "native_mate/object_template_builder.h"
+
+namespace atom {
+
+namespace api {
+
+WebContents::WebContents(content::WebContents* web_contents)
+    : content::WebContentsObserver(web_contents),
+      web_contents_(web_contents) {
+}
+
+void WebContents::RenderViewDeleted(content::RenderViewHost* render_view_host) {
+  base::ListValue args;
+  args.AppendInteger(render_view_host->GetProcess()->GetID());
+  args.AppendInteger(render_view_host->GetRoutingID());
+  Emit("render-view-deleted", args);
+}
+
+void WebContents::RenderProcessGone(base::TerminationStatus status) {
+  Emit("crashed");
+}
+
+void WebContents::DidFinishLoad(int64 frame_id,
+                                const GURL& validated_url,
+                                bool is_main_frame,
+                                content::RenderViewHost* render_view_host) {
+  Emit("did-finish-load");
+}
+
+void WebContents::DidStartLoading(content::RenderViewHost* render_view_host) {
+  Emit("did-start-loading");
+}
+
+void WebContents::DidStopLoading(content::RenderViewHost* render_view_host) {
+  Emit("did-stop-loading");
+}
+
+bool WebContents::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(WebContents, message)
+    IPC_MESSAGE_HANDLER(AtomViewHostMsg_Message, OnRendererMessage)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(AtomViewHostMsg_Message_Sync,
+                                    OnRendererMessageSync)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void WebContents::WebContentsDestroyed(content::WebContents*) {
+  // The RenderViewDeleted was not called when the WebContents is destroyed.
+  RenderViewDeleted(web_contents_->GetRenderViewHost());
+  Emit("destroyed");
+}
+
+bool WebContents::IsAlive() const {
+  return web_contents() != NULL;
+}
+
+void WebContents::LoadURL(const GURL& url) {
+  content::NavigationController::LoadURLParams params(url);
+  params.transition_type = content::PAGE_TRANSITION_TYPED;
+  params.override_user_agent = content::NavigationController::UA_OVERRIDE_TRUE;
+  web_contents()->GetController().LoadURLWithParams(params);
+}
+
+GURL WebContents::GetURL() const {
+  return web_contents()->GetURL();
+}
+
+string16 WebContents::GetTitle() const {
+  return web_contents()->GetTitle();
+}
+
+bool WebContents::IsLoading() const {
+  return web_contents()->IsLoading();
+}
+
+bool WebContents::IsWaitingForResponse() const {
+  return web_contents()->IsWaitingForResponse();
+}
+
+void WebContents::Stop() {
+  web_contents()->Stop();
+}
+
+void WebContents::Reload() {
+  web_contents()->GetController().Reload(false);
+}
+
+void WebContents::ReloadIgnoringCache() {
+  web_contents()->GetController().ReloadIgnoringCache(false);
+}
+
+bool WebContents::CanGoBack() const {
+  return web_contents()->GetController().CanGoBack();
+}
+
+bool WebContents::CanGoForward() const {
+  return web_contents()->GetController().CanGoForward();
+}
+
+bool WebContents::CanGoToOffset(int offset) const {
+  return web_contents()->GetController().CanGoToOffset(offset);
+}
+
+void WebContents::GoBack() {
+  web_contents()->GetController().GoBack();
+}
+
+void WebContents::GoForward() {
+  web_contents()->GetController().GoForward();
+}
+
+void WebContents::GoToIndex(int index) {
+  web_contents()->GetController().GoToIndex(index);
+}
+
+void WebContents::GoToOffset(int offset) {
+  web_contents()->GetController().GoToOffset(offset);
+}
+
+int WebContents::GetRoutingID() const {
+  return web_contents()->GetRoutingID();
+}
+
+int WebContents::GetProcessID() const {
+  return web_contents()->GetRenderProcessHost()->GetID();
+}
+
+bool WebContents::IsCrashed() const {
+  return web_contents()->IsCrashed();
+}
+
+void WebContents::ExecuteJavaScript(const string16& code) {
+  web_contents()->GetRenderViewHost()->ExecuteJavascriptInWebFrame(
+      string16(), code);
+}
+
+bool WebContents::SendIPCMessage(const string16& channel,
+                                 const base::ListValue& args) {
+  return Send(new AtomViewMsg_Message(routing_id(), channel, args));
+}
+
+mate::ObjectTemplateBuilder WebContents::GetObjectTemplateBuilder(
+    v8::Isolate* isolate) {
+  return mate::ObjectTemplateBuilder(isolate)
+      .SetMethod("isAlive", &WebContents::IsAlive)
+      .SetMethod("loadUrl", &WebContents::LoadURL)
+      .SetMethod("getUrl", &WebContents::GetURL)
+      .SetMethod("getTitle", &WebContents::GetTitle)
+      .SetMethod("isLoading", &WebContents::IsLoading)
+      .SetMethod("isWaitingForResponse", &WebContents::IsWaitingForResponse)
+      .SetMethod("stop", &WebContents::Stop)
+      .SetMethod("reload", &WebContents::Reload)
+      .SetMethod("reloadIgnoringCache", &WebContents::ReloadIgnoringCache)
+      .SetMethod("canGoBack", &WebContents::CanGoBack)
+      .SetMethod("canGoForward", &WebContents::CanGoForward)
+      .SetMethod("canGoToOffset", &WebContents::CanGoToOffset)
+      .SetMethod("goBack", &WebContents::GoBack)
+      .SetMethod("goForward", &WebContents::GoForward)
+      .SetMethod("goToIndex", &WebContents::GoToIndex)
+      .SetMethod("goToOffset", &WebContents::GoToOffset)
+      .SetMethod("getRoutingId", &WebContents::GetRoutingID)
+      .SetMethod("getProcessId", &WebContents::GetProcessID)
+      .SetMethod("isCrashed", &WebContents::IsCrashed)
+      .SetMethod("executeJavaScript", &WebContents::ExecuteJavaScript)
+      .SetMethod("_send", &WebContents::SendIPCMessage);
+}
+
+void WebContents::OnRendererMessage(const string16& channel,
+                                    const base::ListValue& args) {
+  // webContents.emit(channel, new Event(), args...);
+  Emit(UTF16ToUTF8(channel), args, web_contents(), NULL);
+}
+
+void WebContents::OnRendererMessageSync(const string16& channel,
+                                        const base::ListValue& args,
+                                        IPC::Message* message) {
+  // webContents.emit(channel, new Event(sender, message), args...);
+  Emit(UTF16ToUTF8(channel), args, web_contents(), message);
+}
+
+// static
+mate::Handle<WebContents> WebContents::Create(
+    v8::Isolate* isolate, content::WebContents* web_contents) {
+  return CreateHandle(isolate, new WebContents(web_contents));
+}
+
+}  // namespace api
+
+}  // namespace atom
diff --git a/atom/browser/api/atom_api_web_contents.h b/atom/browser/api/atom_api_web_contents.h
new file mode 100644
index 000000000000..fb4c6082e7ee
--- /dev/null
+++ b/atom/browser/api/atom_api_web_contents.h
@@ -0,0 +1,84 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_ATOM_API_WEB_CONTENTS_H_
+#define ATOM_BROWSER_API_ATOM_API_WEB_CONTENTS_H_
+
+#include "atom/browser/api/event_emitter.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "native_mate/handle.h"
+
+namespace atom {
+
+namespace api {
+
+class WebContents : public mate::EventEmitter,
+                    public content::WebContentsObserver {
+ public:
+  static mate::Handle<WebContents> Create(v8::Isolate* isolate,
+                                          content::WebContents* web_contents);
+
+  bool IsAlive() const;
+  void LoadURL(const GURL& url);
+  GURL GetURL() const;
+  string16 GetTitle() const;
+  bool IsLoading() const;
+  bool IsWaitingForResponse() const;
+  void Stop();
+  void Reload();
+  void ReloadIgnoringCache();
+  bool CanGoBack() const;
+  bool CanGoForward() const;
+  bool CanGoToOffset(int offset) const;
+  void GoBack();
+  void GoForward();
+  void GoToIndex(int index);
+  void GoToOffset(int offset);
+  int GetRoutingID() const;
+  int GetProcessID() const;
+  bool IsCrashed() const;
+  void ExecuteJavaScript(const string16& code);
+  bool SendIPCMessage(const string16& channel, const base::ListValue& args);
+
+ protected:
+  explicit WebContents(content::WebContents* web_contents);
+
+  // mate::Wrappable implementations:
+  virtual mate::ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) OVERRIDE;
+
+  // content::WebContentsObserver implementations:
+  virtual void RenderViewDeleted(content::RenderViewHost*) OVERRIDE;
+  virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
+  virtual void DidFinishLoad(
+      int64 frame_id,
+      const GURL& validated_url,
+      bool is_main_frame,
+      content::RenderViewHost* render_view_host) OVERRIDE;
+  virtual void DidStartLoading(
+      content::RenderViewHost* render_view_host) OVERRIDE;
+  virtual void DidStopLoading(
+      content::RenderViewHost* render_view_host) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void WebContentsDestroyed(content::WebContents*) OVERRIDE;
+
+ private:
+  // Called when received a message from renderer.
+  void OnRendererMessage(const string16& channel, const base::ListValue& args);
+
+  // Called when received a synchronous message from renderer.
+  void OnRendererMessageSync(const string16& channel,
+                             const base::ListValue& args,
+                             IPC::Message* message);
+
+  content::WebContents* web_contents_;  // Weak.
+
+  DISALLOW_COPY_AND_ASSIGN(WebContents);
+};
+
+}  // namespace api
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_API_ATOM_API_WEB_CONTENTS_H_
diff --git a/atom/browser/api/atom_api_window.cc b/atom/browser/api/atom_api_window.cc
index c30db210593d..dae2abb93ebf 100644
--- a/atom/browser/api/atom_api_window.cc
+++ b/atom/browser/api/atom_api_window.cc
@@ -4,15 +4,12 @@
 
 #include "atom/browser/api/atom_api_window.h"
 
+#include "atom/browser/api/atom_api_web_contents.h"
 #include "atom/browser/native_window.h"
 #include "atom/common/native_mate_converters/function_converter.h"
-#include "atom/common/native_mate_converters/gurl_converter.h"
-#include "atom/common/native_mate_converters/string16_converter.h"
 #include "atom/common/native_mate_converters/value_converter.h"
 #include "base/bind.h"
 #include "base/callback.h"
-#include "content/public/browser/navigation_entry.h"
-#include "content/public/browser/web_contents.h"
 #include "content/public/browser/render_process_host.h"
 #include "native_mate/constructor.h"
 #include "native_mate/dictionary.h"
@@ -22,8 +19,6 @@
 
 #include "atom/common/node_includes.h"
 
-using content::NavigationController;
-
 namespace mate {
 
 template<>
@@ -86,12 +81,6 @@ void Window::OnPageTitleUpdated(bool* prevent_default,
   *prevent_default = Emit("page-title-updated", args);
 }
 
-void Window::OnLoadingStateChanged(bool is_loading) {
-  base::ListValue args;
-  args.AppendBoolean(is_loading);
-  Emit("loading-state-changed", args);
-}
-
 void Window::WillCloseWindow(bool* prevent_default) {
   *prevent_default = Emit("close");
 }
@@ -114,17 +103,6 @@ void Window::OnRendererResponsive() {
   Emit("responsive");
 }
 
-void Window::OnRenderViewDeleted(int process_id, int routing_id) {
-  base::ListValue args;
-  args.AppendInteger(process_id);
-  args.AppendInteger(routing_id);
-  Emit("render-view-deleted", args);
-}
-
-void Window::OnRendererCrashed() {
-  Emit("crashed");
-}
-
 // static
 mate::Wrappable* Window::New(mate::Arguments* args,
                              const base::DictionaryValue& options) {
@@ -326,96 +304,13 @@ void Window::CapturePage(mate::Arguments* args) {
   window_->CapturePage(rect, base::Bind(&OnCapturePageDone, callback));
 }
 
-string16 Window::GetPageTitle() {
-  return window_->GetWebContents()->GetTitle();
+mate::Handle<WebContents> Window::GetWebContents(v8::Isolate* isolate) const {
+  return WebContents::Create(isolate, window_->GetWebContents());
 }
 
-bool Window::IsLoading() {
-  return window_->GetWebContents()->IsLoading();
-}
-
-bool Window::IsWaitingForResponse() {
-  return window_->GetWebContents()->IsWaitingForResponse();
-}
-
-void Window::Stop() {
-  window_->GetWebContents()->Stop();
-}
-
-int Window::GetRoutingID() {
-  return window_->GetWebContents()->GetRoutingID();
-}
-
-int Window::GetProcessID() {
-  return window_->GetWebContents()->GetRenderProcessHost()->GetID();
-}
-
-bool Window::IsCrashed() {
-  return window_->GetWebContents()->IsCrashed();
-}
-
-mate::Dictionary Window::GetDevTools(v8::Isolate* isolate) {
-  mate::Dictionary dict(mate::Dictionary::CreateEmpty(isolate));
-  content::WebContents* web_contents = window_->GetDevToolsWebContents();
-  dict.Set("processId", web_contents->GetRenderProcessHost()->GetID());
-  dict.Set("routingId", web_contents->GetRoutingID());
-  return dict;
-}
-
-void Window::ExecuteJavaScriptInDevTools(const std::string& code) {
-  window_->ExecuteJavaScriptInDevTools(code);
-}
-
-void Window::LoadURL(const GURL& url) {
-  NavigationController& controller = window_->GetWebContents()->GetController();
-
-  content::NavigationController::LoadURLParams params(url);
-  params.transition_type = content::PAGE_TRANSITION_TYPED;
-  params.override_user_agent = content::NavigationController::UA_OVERRIDE_TRUE;
-  controller.LoadURLWithParams(params);
-}
-
-GURL Window::GetURL() {
-  NavigationController& controller = window_->GetWebContents()->GetController();
-  if (!controller.GetActiveEntry())
-    return GURL();
-  return controller.GetActiveEntry()->GetVirtualURL();
-}
-
-bool Window::CanGoBack() {
-  return window_->GetWebContents()->GetController().CanGoBack();
-}
-
-bool Window::CanGoForward() {
-  return window_->GetWebContents()->GetController().CanGoForward();
-}
-
-bool Window::CanGoToOffset(int offset) {
-  return window_->GetWebContents()->GetController().CanGoToOffset(offset);
-}
-
-void Window::GoBack() {
-  window_->GetWebContents()->GetController().GoBack();
-}
-
-void Window::GoForward() {
-  window_->GetWebContents()->GetController().GoForward();
-}
-
-void Window::GoToIndex(int index) {
-  window_->GetWebContents()->GetController().GoToIndex(index);
-}
-
-void Window::GoToOffset(int offset) {
-  window_->GetWebContents()->GetController().GoToOffset(offset);
-}
-
-void Window::Reload() {
-  window_->GetWebContents()->GetController().Reload(false);
-}
-
-void Window::ReloadIgnoringCache() {
-  window_->GetWebContents()->GetController().ReloadIgnoringCache(false);
+mate::Handle<WebContents> Window::GetDevToolsWebContents(
+    v8::Isolate* isolate) const {
+  return WebContents::Create(isolate, window_->GetDevToolsWebContents());
 }
 
 // static
@@ -462,27 +357,8 @@ void Window::BuildPrototype(v8::Isolate* isolate,
       .SetMethod("blurWebView", &Window::BlurWebView)
       .SetMethod("isWebViewFocused", &Window::IsWebViewFocused)
       .SetMethod("capturePage", &Window::CapturePage)
-      .SetMethod("getPageTitle", &Window::GetPageTitle)
-      .SetMethod("isLoading", &Window::IsLoading)
-      .SetMethod("isWaitingForResponse", &Window::IsWaitingForResponse)
-      .SetMethod("stop", &Window::Stop)
-      .SetMethod("getRoutingId", &Window::GetRoutingID)
-      .SetMethod("getProcessId", &Window::GetProcessID)
-      .SetMethod("isCrashed", &Window::IsCrashed)
-      .SetMethod("getDevTools", &Window::GetDevTools)
-      .SetMethod("executeJavaScriptInDevTools",
-                 &Window::ExecuteJavaScriptInDevTools)
-      .SetMethod("loadUrl", &Window::LoadURL)
-      .SetMethod("getUrl", &Window::GetURL)
-      .SetMethod("canGoBack", &Window::CanGoBack)
-      .SetMethod("canGoForward", &Window::CanGoForward)
-      .SetMethod("canGoToOffset", &Window::CanGoToOffset)
-      .SetMethod("goBack", &Window::GoBack)
-      .SetMethod("goForward", &Window::GoForward)
-      .SetMethod("goToIndex", &Window::GoToIndex)
-      .SetMethod("goToOffset", &Window::GoToOffset)
-      .SetMethod("reload", &Window::Reload)
-      .SetMethod("reloadIgnoringCache", &Window::ReloadIgnoringCache);
+      .SetMethod("_getWebContents", &Window::GetWebContents)
+      .SetMethod("_getDevToolsWebContents", &Window::GetDevToolsWebContents);
 }
 
 }  // namespace api
diff --git a/atom/browser/api/atom_api_window.h b/atom/browser/api/atom_api_window.h
index d9663231a9e0..4d762bee90b3 100644
--- a/atom/browser/api/atom_api_window.h
+++ b/atom/browser/api/atom_api_window.h
@@ -11,6 +11,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "atom/browser/native_window_observer.h"
 #include "atom/browser/api/event_emitter.h"
+#include "native_mate/handle.h"
 
 class GURL;
 
@@ -29,6 +30,8 @@ class NativeWindow;
 
 namespace api {
 
+class WebContents;
+
 class Window : public mate::EventEmitter,
                public NativeWindowObserver {
  public:
@@ -47,14 +50,11 @@ class Window : public mate::EventEmitter,
   // Implementations of NativeWindowObserver:
   virtual void OnPageTitleUpdated(bool* prevent_default,
                                   const std::string& title) OVERRIDE;
-  virtual void OnLoadingStateChanged(bool is_loading) OVERRIDE;
   virtual void WillCloseWindow(bool* prevent_default) OVERRIDE;
   virtual void OnWindowClosed() OVERRIDE;
   virtual void OnWindowBlur() OVERRIDE;
   virtual void OnRendererUnresponsive() OVERRIDE;
   virtual void OnRendererResponsive() OVERRIDE;
-  virtual void OnRenderViewDeleted(int process_id, int routing_id) OVERRIDE;
-  virtual void OnRendererCrashed() OVERRIDE;
 
  private:
   // APIs for NativeWindow.
@@ -100,30 +100,8 @@ class Window : public mate::EventEmitter,
   void CapturePage(mate::Arguments* args);
 
   // APIs for WebContents.
-  string16 GetPageTitle();
-  bool IsLoading();
-  bool IsWaitingForResponse();
-  void Stop();
-  int GetRoutingID();
-  int GetProcessID();
-  bool IsCrashed();
-
-  // APIs for devtools.
-  mate::Dictionary GetDevTools(v8::Isolate* isolate);
-  void ExecuteJavaScriptInDevTools(const std::string& code);
-
-  // APIs for NavigationController.
-  void LoadURL(const GURL& url);
-  GURL GetURL();
-  bool CanGoBack();
-  bool CanGoForward();
-  bool CanGoToOffset(int offset);
-  void GoBack();
-  void GoForward();
-  void GoToIndex(int index);
-  void GoToOffset(int offset);
-  void Reload();
-  void ReloadIgnoringCache();
+  mate::Handle<WebContents> GetWebContents(v8::Isolate* isolate) const;
+  mate::Handle<WebContents> GetDevToolsWebContents(v8::Isolate* isolate) const;
 
   scoped_ptr<NativeWindow> window_;
 
diff --git a/atom/browser/api/atom_browser_bindings.cc b/atom/browser/api/atom_browser_bindings.cc
deleted file mode 100644
index b6b0ae6e280c..000000000000
--- a/atom/browser/api/atom_browser_bindings.cc
+++ /dev/null
@@ -1,93 +0,0 @@
-// Copyright (c) 2013 GitHub, Inc. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "atom/browser/api/atom_browser_bindings.h"
-
-#include <vector>
-
-#include "atom/browser/api/event.h"
-#include "atom/common/native_mate_converters/string16_converter.h"
-#include "atom/common/native_mate_converters/v8_value_converter.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/values.h"
-
-#include "atom/common/node_includes.h"
-
-namespace atom {
-
-AtomBrowserBindings::AtomBrowserBindings() {
-}
-
-void AtomBrowserBindings::OnRendererMessage(int process_id,
-                                            int routing_id,
-                                            const string16& channel,
-                                            const base::ListValue& args) {
-  v8::Locker locker(node_isolate);
-  v8::HandleScope handle_scope(node_isolate);
-
-  scoped_ptr<V8ValueConverter> converter(new V8ValueConverter);
-
-  // process.emit(channel, 'message', process_id, routing_id);
-  std::vector<v8::Handle<v8::Value>> arguments;
-  arguments.reserve(3 + args.GetSize());
-  arguments.push_back(mate::ConvertToV8(node_isolate, channel));
-  const base::Value* value;
-  if (args.Get(0, &value))
-    arguments.push_back(converter->ToV8Value(value, global_env->context()));
-  arguments.push_back(v8::Integer::New(process_id));
-  arguments.push_back(v8::Integer::New(routing_id));
-
-  for (size_t i = 1; i < args.GetSize(); i++) {
-    const base::Value* value;
-    if (args.Get(i, &value))
-      arguments.push_back(converter->ToV8Value(value, global_env->context()));
-  }
-
-  node::MakeCallback(global_env->process_object(),
-                     "emit",
-                     arguments.size(),
-                     &arguments[0]);
-}
-
-void AtomBrowserBindings::OnRendererMessageSync(
-    int process_id,
-    int routing_id,
-    const string16& channel,
-    const base::ListValue& args,
-    content::WebContents* sender,
-    IPC::Message* message) {
-  v8::Locker locker(node_isolate);
-  v8::HandleScope handle_scope(node_isolate);
-
-  scoped_ptr<V8ValueConverter> converter(new V8ValueConverter);
-
-  // Create the event object.
-  mate::Handle<mate::Event> event = mate::Event::Create(node_isolate);
-  event->SetSenderAndMessage(sender, message);
-
-  // process.emit(channel, 'sync-message', event, process_id, routing_id);
-  std::vector<v8::Handle<v8::Value>> arguments;
-  arguments.reserve(3 + args.GetSize());
-  arguments.push_back(mate::ConvertToV8(node_isolate, channel));
-  const base::Value* value;
-  if (args.Get(0, &value))
-    arguments.push_back(converter->ToV8Value(value, global_env->context()));
-  arguments.push_back(event.ToV8());
-  arguments.push_back(v8::Integer::New(process_id));
-  arguments.push_back(v8::Integer::New(routing_id));
-
-  for (size_t i = 1; i < args.GetSize(); i++) {
-    const base::Value* value;
-    if (args.Get(i, &value))
-      arguments.push_back(converter->ToV8Value(value, global_env->context()));
-  }
-
-  node::MakeCallback(global_env->process_object(),
-                     "emit",
-                     arguments.size(),
-                     &arguments[0]);
-}
-
-}  // namespace atom
diff --git a/atom/browser/api/atom_browser_bindings.h b/atom/browser/api/atom_browser_bindings.h
deleted file mode 100644
index e967a4020f82..000000000000
--- a/atom/browser/api/atom_browser_bindings.h
+++ /dev/null
@@ -1,49 +0,0 @@
-// Copyright (c) 2013 GitHub, Inc. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ATOM_BROWSER_API_ATOM_BROWSER_BINDINGS_H_
-#define ATOM_BROWSER_API_ATOM_BROWSER_BINDINGS_H_
-
-#include "atom/common/api/atom_bindings.h"
-#include "base/strings/string16.h"
-
-namespace base {
-class ListValue;
-}
-
-namespace content {
-class WebContents;
-}
-
-namespace IPC {
-class Message;
-}
-
-namespace atom {
-
-class AtomBrowserBindings : public AtomBindings {
- public:
-  AtomBrowserBindings();
-
-  // Called when received a message from renderer.
-  void OnRendererMessage(int process_id,
-                         int routing_id,
-                         const string16& channel,
-                         const base::ListValue& args);
-
-  // Called when received a synchronous message from renderer.
-  void OnRendererMessageSync(int process_id,
-                             int routing_id,
-                             const string16& channel,
-                             const base::ListValue& args,
-                             content::WebContents* sender,
-                             IPC::Message* message);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AtomBrowserBindings);
-};
-
-}  // namespace atom
-
-#endif  // ATOM_BROWSER_API_ATOM_BROWSER_BINDINGS_H_
diff --git a/atom/browser/api/event_emitter.cc b/atom/browser/api/event_emitter.cc
index 5192c63488e1..45ede157d939 100644
--- a/atom/browser/api/event_emitter.cc
+++ b/atom/browser/api/event_emitter.cc
@@ -24,6 +24,13 @@ bool EventEmitter::Emit(const base::StringPiece& name) {
 
 bool EventEmitter::Emit(const base::StringPiece& name,
                         const base::ListValue& args) {
+  return Emit(name, args, NULL, NULL);
+}
+
+bool EventEmitter::Emit(const base::StringPiece& name,
+                        const base::ListValue& args,
+                        content::WebContents* sender,
+                        IPC::Message* message) {
   v8::Locker locker(node_isolate);
   v8::HandleScope handle_scope(node_isolate);
 
@@ -31,6 +38,8 @@ bool EventEmitter::Emit(const base::StringPiece& name,
   scoped_ptr<atom::V8ValueConverter> converter(new atom::V8ValueConverter);
 
   mate::Handle<mate::Event> event = mate::Event::Create(node_isolate);
+  if (sender && message)
+    event->SetSenderAndMessage(sender, message);
 
   // v8_args = [name, event, args...];
   std::vector<v8::Handle<v8::Value>> v8_args;
diff --git a/atom/browser/api/event_emitter.h b/atom/browser/api/event_emitter.h
index 44e586c020d5..9a570319d478 100644
--- a/atom/browser/api/event_emitter.h
+++ b/atom/browser/api/event_emitter.h
@@ -11,6 +11,14 @@ namespace base {
 class ListValue;
 }
 
+namespace content {
+class WebContents;
+}
+
+namespace IPC {
+class Message;
+}
+
 namespace mate {
 
 // Provide helperers to emit event in JavaScript.
@@ -18,12 +26,16 @@ class EventEmitter : public Wrappable {
  protected:
   EventEmitter();
 
-  // this.emit(name);
+  // this.emit(name, new Event());
   bool Emit(const base::StringPiece& name);
 
-  // this.emit(name, args...);
+  // this.emit(name, new Event(), args...);
   bool Emit(const base::StringPiece& name, const base::ListValue& args);
 
+  // this.emit(name, new Event(sender, message), args...);
+  bool Emit(const base::StringPiece& name, const base::ListValue& args,
+            content::WebContents* sender, IPC::Message* message);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(EventEmitter);
 };
diff --git a/atom/browser/api/lib/browser-window.coffee b/atom/browser/api/lib/browser-window.coffee
index 18dacbf2e6e7..9a1f26a58506 100644
--- a/atom/browser/api/lib/browser-window.coffee
+++ b/atom/browser/api/lib/browser-window.coffee
@@ -1,6 +1,7 @@
 EventEmitter = require('events').EventEmitter
 IDWeakMap = require 'id-weak-map'
 app = require 'app'
+wrapWebContents = require('web-contents').wrap
 
 BrowserWindow = process.atomBinding('window').BrowserWindow
 BrowserWindow::__proto__ = EventEmitter.prototype
@@ -14,6 +15,20 @@ BrowserWindow::_init = ->
     menu = app.getApplicationMenu()
     @setMenu menu if menu?
 
+  @webContents = @getWebContents()
+  @webContents.once 'destroyed', => @webContents = null
+
+  # Define getter for devToolsWebContents.
+  devToolsWebContents = null
+  @__defineGetter__ 'devToolsWebContents', ->
+    if @isDevToolsOpened()
+      # Get a new devToolsWebContents if previous one has been destroyed, it
+      # could happen when the devtools has been closed and then reopened.
+      devToolsWebContents = null unless devToolsWebContents?.isAlive()
+      devToolsWebContents ?= @getDevToolsWebContents()
+    else
+      devToolsWebContents = null
+
   # Remember the window.
   id = BrowserWindow.windows.add this
 
@@ -24,12 +39,18 @@ BrowserWindow::_init = ->
 
   # Tell the rpc server that a render view has been deleted and we need to
   # release all objects owned by it.
-  @on 'render-view-deleted', (event, processId, routingId) ->
-    process.emit 'ATOM_BROWSER_RELEASE_RENDER_VIEW', processId, routingId
+  @webContents.on 'render-view-deleted', (event, processId, routingId) ->
+    process.emit 'ATOM_BROWSER_RELEASE_RENDER_VIEW', "#{processId}-#{routingId}"
 
 BrowserWindow::toggleDevTools = ->
   if @isDevToolsOpened() then @closeDevTools() else @openDevTools()
 
+BrowserWindow::getWebContents = ->
+  wrapWebContents @_getWebContents()
+
+BrowserWindow::getDevToolsWebContents = ->
+  wrapWebContents @_getDevToolsWebContents()
+
 BrowserWindow::restart = ->
   @loadUrl(@getUrl())
 
@@ -50,16 +71,30 @@ BrowserWindow.getFocusedWindow = ->
   windows = BrowserWindow.getAllWindows()
   return window for window in windows when window.isFocused()
 
-BrowserWindow.fromProcessIdAndRoutingId = (processId, routingId) ->
+BrowserWindow.fromWebContents = (webContents) ->
   windows = BrowserWindow.getAllWindows()
-  return window for window in windows when window.getProcessId() == processId and
-                                           window.getRoutingId() == routingId
+  return window for window in windows when webContents.equal window.webContents
 
-BrowserWindow.fromDevTools = (processId, routingId) ->
+BrowserWindow.fromDevToolsWebContents = (webContents) ->
   windows = BrowserWindow.getAllWindows()
-  for window in windows when window.isDevToolsOpened()
-    devtools = window.getDevTools()
-    return window if devtools.processId == processId and
-                     devtools.routingId == routingId
+  return window for window in windows when webContents.equal window.devToolsWebContents
+
+# Helpers.
+BrowserWindow::loadUrl = -> @webContents.loadUrl.apply @webContents, arguments
+BrowserWindow::send = -> @webContents.send.apply @webContents, arguments
+
+# Be compatible with old API.
+BrowserWindow::getUrl = -> @webContents.getUrl()
+BrowserWindow::reload = -> @webContents.reload()
+BrowserWindow::reloadIgnoringCache = -> @webContents.reloadIgnoringCache()
+BrowserWindow::getPageTitle = -> @webContents.getTitle()
+BrowserWindow::isLoading = -> @webContents.isLoading()
+BrowserWindow::isWaitingForResponse = -> @webContents.isWaitingForResponse()
+BrowserWindow::stop = -> @webContents.stop()
+BrowserWindow::getRoutingId = -> @webContents.getRoutingId()
+BrowserWindow::getProcessId = -> @webContents.getProcessId()
+BrowserWindow::isCrashed = -> @webContents.isCrashed()
+BrowserWindow::executeJavaScriptInDevTools = (code) ->
+  @devToolsWebContents.executeJavaScript code
 
 module.exports = BrowserWindow
diff --git a/atom/browser/api/lib/ipc.coffee b/atom/browser/api/lib/ipc.coffee
index c93ed4f20576..71cf1d17e491 100644
--- a/atom/browser/api/lib/ipc.coffee
+++ b/atom/browser/api/lib/ipc.coffee
@@ -1,32 +1,3 @@
 EventEmitter = require('events').EventEmitter
-send = process.atomBinding('ipc').send
 
-sendWrap = (channel, processId, routingId, args...) ->
-  BrowserWindow = require 'browser-window'
-  if processId?.constructor is BrowserWindow
-    window = processId
-    args = [routingId, args...]
-    processId = window.getProcessId()
-    routingId = window.getRoutingId()
-
-  send channel, processId, routingId, [args...]
-
-class Ipc extends EventEmitter
-  constructor: ->
-    process.on 'ATOM_INTERNAL_MESSAGE', (args...) =>
-      @emit(args...)
-    process.on 'ATOM_INTERNAL_MESSAGE_SYNC', (channel, event, args...) =>
-      set = (value) -> event.sendReply JSON.stringify(value)
-
-      Object.defineProperty event, 'returnValue', {set}
-      Object.defineProperty event, 'result', {set}
-
-      @emit(channel, event, args...)
-
-  send: (processId, routingId, args...) ->
-    @sendChannel(processId, routingId, 'message', args...)
-
-  sendChannel: (args...) ->
-    sendWrap('ATOM_INTERNAL_MESSAGE', args...)
-
-module.exports = new Ipc
+module.exports = new EventEmitter
diff --git a/atom/browser/api/lib/web-contents.coffee b/atom/browser/api/lib/web-contents.coffee
new file mode 100644
index 000000000000..5e7212334764
--- /dev/null
+++ b/atom/browser/api/lib/web-contents.coffee
@@ -0,0 +1,27 @@
+EventEmitter = require('events').EventEmitter
+ipc = require 'ipc'
+
+module.exports.wrap = (webContents) ->
+  return null unless webContents.isAlive()
+
+  # webContents is an EventEmitter.
+  webContents.__proto__ = EventEmitter.prototype
+
+  # WebContents::send(channel, args..)
+  webContents.send = (args...) ->
+    @_send 'ATOM_INTERNAL_MESSAGE', [args...]
+
+  # The processId and routingId and identify a webContents.
+  webContents.getId = -> "#{@getProcessId()}-#{@getRoutingId()}"
+  webContents.equal = (other) -> @getId() is other.getId()
+
+  # Dispatch IPC messages to the ipc module.
+  webContents.on 'ipc-message', (event, channel, args...) =>
+    Object.defineProperty event, 'sender', value: webContents
+    ipc.emit channel, event, args...
+  webContents.on 'ipc-message-sync', (event, channel, args...) =>
+    Object.defineProperty event, 'returnValue', set: (value) -> event.sendReply JSON.stringify(value)
+    Object.defineProperty event, 'sender', value: webContents
+    ipc.emit channel, event, args...
+
+  webContents
diff --git a/atom/browser/atom_browser_main_parts.cc b/atom/browser/atom_browser_main_parts.cc
index 139b15801424..ef8c95b260b1 100644
--- a/atom/browser/atom_browser_main_parts.cc
+++ b/atom/browser/atom_browser_main_parts.cc
@@ -4,10 +4,10 @@
 
 #include "atom/browser/atom_browser_main_parts.h"
 
-#include "atom/browser/api/atom_browser_bindings.h"
 #include "atom/browser/atom_browser_client.h"
 #include "atom/browser/atom_browser_context.h"
 #include "atom/browser/browser.h"
+#include "atom/common/api/atom_bindings.h"
 #include "atom/common/node_bindings.h"
 #include "net/proxy/proxy_resolver_v8.h"
 
@@ -23,7 +23,7 @@ namespace atom {
 AtomBrowserMainParts* AtomBrowserMainParts::self_ = NULL;
 
 AtomBrowserMainParts::AtomBrowserMainParts()
-    : atom_bindings_(new AtomBrowserBindings),
+    : atom_bindings_(new AtomBindings),
       browser_(new Browser),
       node_bindings_(NodeBindings::Create(true)) {
   DCHECK(!self_) << "Cannot have two AtomBrowserMainParts";
diff --git a/atom/browser/atom_browser_main_parts.h b/atom/browser/atom_browser_main_parts.h
index 896f36e00e02..41de38699e11 100644
--- a/atom/browser/atom_browser_main_parts.h
+++ b/atom/browser/atom_browser_main_parts.h
@@ -9,7 +9,7 @@
 
 namespace atom {
 
-class AtomBrowserBindings;
+class AtomBindings;
 class Browser;
 class NodeBindings;
 
@@ -20,7 +20,6 @@ class AtomBrowserMainParts : public brightray::BrowserMainParts {
 
   static AtomBrowserMainParts* Get();
 
-  AtomBrowserBindings* atom_bindings() { return atom_bindings_.get(); }
   Browser* browser() { return browser_.get(); }
 
  protected:
@@ -37,7 +36,7 @@ class AtomBrowserMainParts : public brightray::BrowserMainParts {
 #endif
 
  private:
-  scoped_ptr<AtomBrowserBindings> atom_bindings_;
+  scoped_ptr<AtomBindings> atom_bindings_;
   scoped_ptr<Browser> browser_;
   scoped_ptr<NodeBindings> node_bindings_;
 
diff --git a/atom/browser/devtools_web_contents_observer.cc b/atom/browser/devtools_web_contents_observer.cc
deleted file mode 100644
index 331a1253ca6c..000000000000
--- a/atom/browser/devtools_web_contents_observer.cc
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright (c) 2014 GitHub, Inc. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "atom/browser/devtools_web_contents_observer.h"
-
-#include "atom/browser/api/atom_browser_bindings.h"
-#include "atom/browser/atom_browser_main_parts.h"
-#include "atom/browser/native_window.h"
-#include "atom/common/api/api_messages.h"
-#include "base/logging.h"
-#include "content/public/browser/render_process_host.h"
-#include "ipc/ipc_message_macros.h"
-
-namespace atom {
-
-DevToolsWebContentsObserver::DevToolsWebContentsObserver(
-    NativeWindow* native_window,
-    content::WebContents* web_contents)
-    : content::WebContentsObserver(web_contents),
-      inspected_window_(native_window) {
-  DCHECK(native_window);
-}
-
-DevToolsWebContentsObserver::~DevToolsWebContentsObserver() {
-}
-
-bool DevToolsWebContentsObserver::OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(DevToolsWebContentsObserver, message)
-    IPC_MESSAGE_HANDLER(AtomViewHostMsg_Message, OnRendererMessage)
-    IPC_MESSAGE_HANDLER_DELAY_REPLY(AtomViewHostMsg_Message_Sync,
-                                    OnRendererMessageSync)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-
-  return handled;
-}
-
-void DevToolsWebContentsObserver::OnRendererMessage(
-    const string16& channel,
-    const base::ListValue& args) {
-  AtomBrowserMainParts::Get()->atom_bindings()->OnRendererMessage(
-      web_contents()->GetRenderProcessHost()->GetID(),
-      web_contents()->GetRoutingID(),
-      channel,
-      args);
-}
-
-void DevToolsWebContentsObserver::OnRendererMessageSync(
-    const string16& channel,
-    const base::ListValue& args,
-    IPC::Message* reply_msg) {
-  AtomBrowserMainParts::Get()->atom_bindings()->OnRendererMessageSync(
-      web_contents()->GetRenderProcessHost()->GetID(),
-      web_contents()->GetRoutingID(),
-      channel,
-      args,
-      web_contents(),
-      reply_msg);
-}
-
-}  // namespace atom
diff --git a/atom/browser/devtools_web_contents_observer.h b/atom/browser/devtools_web_contents_observer.h
deleted file mode 100644
index 3fc2222a43b7..000000000000
--- a/atom/browser/devtools_web_contents_observer.h
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright (c) 2014 GitHub, Inc. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ATOM_BROWSER_DEVTOOLS_WEB_CONTENTS_OBSERVER_H_
-#define ATOM_BROWSER_DEVTOOLS_WEB_CONTENTS_OBSERVER_H_
-
-#include "content/public/browser/web_contents_observer.h"
-
-namespace base {
-class ListValue;
-}
-
-namespace atom {
-
-class NativeWindow;
-
-class DevToolsWebContentsObserver : public content::WebContentsObserver {
- public:
-  DevToolsWebContentsObserver(NativeWindow* native_window,
-                              content::WebContents* web_contents);
-  virtual ~DevToolsWebContentsObserver();
-
- protected:
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
-  void OnRendererMessage(const string16& channel,
-                         const base::ListValue& args);
-  void OnRendererMessageSync(const string16& channel,
-                             const base::ListValue& args,
-                             IPC::Message* reply_msg);
-
- private:
-  NativeWindow* inspected_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(DevToolsWebContentsObserver);
-};
-
-}  // namespace atom
-
-#endif  // ATOM_BROWSER_DEVTOOLS_WEB_CONTENTS_OBSERVER_H_
diff --git a/atom/browser/lib/objects-registry.coffee b/atom/browser/lib/objects-registry.coffee
index 1bae8f6e4e50..e159730330e2 100644
--- a/atom/browser/lib/objects-registry.coffee
+++ b/atom/browser/lib/objects-registry.coffee
@@ -29,13 +29,11 @@ class ObjectsStore
     throw new Error("Invalid key #{id} for ObjectsStore") unless @has id
     @objects[id]
 
-  @forRenderView: (processId, routingId) ->
-    key = "#{processId}_#{routingId}"
+  @forRenderView: (key) ->
     @stores[key] = new ObjectsStore unless @stores[key]?
     @stores[key]
 
-  @releaseForRenderView: (processId, routingId) ->
-    key = "#{processId}_#{routingId}"
+  @releaseForRenderView: (key) ->
     delete @stores[key]
 
 class ObjectsRegistry extends EventEmitter
@@ -52,7 +50,7 @@ class ObjectsRegistry extends EventEmitter
 
   # Register a new object, the object would be kept referenced until you release
   # it explicitly.
-  add: (processId, routingId, obj) ->
+  add: (key, obj) ->
     # Some native objects may already been added to objectsWeakMap, be care not
     # to add it twice.
     @objectsWeakMap.add obj unless v8Util.getHiddenValue obj, 'atomId'
@@ -63,7 +61,7 @@ class ObjectsRegistry extends EventEmitter
     # with the storeId.
     # We use a difference key because the same object can be referenced for
     # multiple times by the same renderer view.
-    store = ObjectsStore.forRenderView processId, routingId
+    store = ObjectsStore.forRenderView key
     storeId = store.add obj
 
     [id, storeId]
@@ -73,12 +71,12 @@ class ObjectsRegistry extends EventEmitter
     @objectsWeakMap.get id
 
   # Remove an object according to its storeId.
-  remove: (processId, routingId, storeId) ->
-    ObjectsStore.forRenderView(processId, routingId).remove storeId
+  remove: (key, storeId) ->
+    ObjectsStore.forRenderView(key).remove storeId
 
   # Clear all references to objects from renderer view.
-  clear: (processId, routingId) ->
-    @emit "release-renderer-view-#{processId}-#{routingId}"
-    ObjectsStore.releaseForRenderView processId, routingId
+  clear: (key) ->
+    @emit "clear-#{key}"
+    ObjectsStore.releaseForRenderView key
 
 module.exports = new ObjectsRegistry
diff --git a/atom/browser/lib/rpc-server.coffee b/atom/browser/lib/rpc-server.coffee
index e10f875328e3..a28c4b25af3f 100644
--- a/atom/browser/lib/rpc-server.coffee
+++ b/atom/browser/lib/rpc-server.coffee
@@ -4,7 +4,7 @@ objectsRegistry = require './objects-registry.js'
 v8Util = process.atomBinding 'v8_util'
 
 # Convert a real value into meta data.
-valueToMeta = (processId, routingId, value) ->
+valueToMeta = (sender, value) ->
   meta = type: typeof value
 
   meta.type = 'value' if value is null
@@ -15,14 +15,14 @@ valueToMeta = (processId, routingId, value) ->
 
   if meta.type is 'array'
     meta.members = []
-    meta.members.push valueToMeta(processId, routingId, el) for el in value
+    meta.members.push valueToMeta(sender, el) for el in value
   else if meta.type is 'object' or meta.type is 'function'
     meta.name = value.constructor.name
 
     # Reference the original value if it's an object, because when it's
     # passed to renderer we would assume the renderer keeps a reference of
     # it.
-    [meta.id, meta.storeId] = objectsRegistry.add processId, routingId, value
+    [meta.id, meta.storeId] = objectsRegistry.add sender.getId(), value
 
     meta.members = []
     meta.members.push {name: prop, type: typeof field} for prop, field of value
@@ -37,12 +37,12 @@ errorToMeta = (error) ->
   type: 'error', message: error.message, stack: (error.stack || error)
 
 # Convert array of meta data from renderer into array of real values.
-unwrapArgs = (processId, routingId, args) ->
+unwrapArgs = (sender, args) ->
   metaToValue = (meta) ->
     switch meta.type
       when 'value' then meta.value
       when 'remote-object' then objectsRegistry.get meta.id
-      when 'array' then unwrapArgs processId, routingId, meta.value
+      when 'array' then unwrapArgs sender, meta.value
       when 'object'
         ret = v8Util.createObjectWithName meta.name
         for member in meta.members
@@ -53,15 +53,15 @@ unwrapArgs = (processId, routingId, args) ->
         -> returnValue
       when 'function'
         rendererReleased = false
-        objectsRegistry.once "release-renderer-view-#{processId}-#{routingId}", ->
+        objectsRegistry.once "clear-#{sender.getId()}", ->
           rendererReleased = true
 
         ret = ->
           throw new Error('Calling a callback of released renderer view') if rendererReleased
-          ipc.sendChannel processId, routingId, 'ATOM_RENDERER_CALLBACK', meta.id, valueToMeta(processId, routingId, arguments)
+          sender.send 'ATOM_RENDERER_CALLBACK', meta.id, valueToMeta(sender, arguments)
         v8Util.setDestructor ret, ->
           return if rendererReleased
-          ipc.sendChannel processId, routingId, 'ATOM_RENDERER_RELEASE_CALLBACK', meta.id
+          sender.send 'ATOM_RENDERER_RELEASE_CALLBACK', meta.id
         ret
       else throw new TypeError("Unknown type: #{meta.type}")
 
@@ -69,78 +69,78 @@ unwrapArgs = (processId, routingId, args) ->
 
 # Call a function and send reply asynchronously if it's a an asynchronous
 # style function and the caller didn't pass a callback.
-callFunction = (event, processId, routingId, func, caller, args) ->
+callFunction = (event, func, caller, args) ->
   if v8Util.getHiddenValue(func, 'asynchronous') and typeof args[args.length - 1] isnt 'function'
     args.push (ret) ->
-      event.returnValue = valueToMeta processId, routingId, ret
+      event.returnValue = valueToMeta event.sender, ret
     func.apply caller, args
   else
     ret = func.apply caller, args
-    event.returnValue = valueToMeta processId, routingId, ret
+    event.returnValue = valueToMeta event.sender, ret
 
 # Send by BrowserWindow when its render view is deleted.
-process.on 'ATOM_BROWSER_RELEASE_RENDER_VIEW', (processId, routingId) ->
-  objectsRegistry.clear processId, routingId
+process.on 'ATOM_BROWSER_RELEASE_RENDER_VIEW', (id) ->
+  objectsRegistry.clear id
 
-ipc.on 'ATOM_BROWSER_REQUIRE', (event, processId, routingId, module) ->
+ipc.on 'ATOM_BROWSER_REQUIRE', (event, module) ->
   try
-    event.returnValue = valueToMeta processId, routingId, require(module)
+    event.returnValue = valueToMeta event.sender, require(module)
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_GLOBAL', (event, processId, routingId, name) ->
+ipc.on 'ATOM_BROWSER_GLOBAL', (event, name) ->
   try
-    event.returnValue = valueToMeta processId, routingId, global[name]
+    event.returnValue = valueToMeta event.sender, global[name]
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_CURRENT_WINDOW', (event, processId, routingId) ->
+ipc.on 'ATOM_BROWSER_CURRENT_WINDOW', (event) ->
   try
     BrowserWindow = require 'browser-window'
-    window = BrowserWindow.fromProcessIdAndRoutingId processId, routingId
-    window = BrowserWindow.fromDevTools processId, routingId unless window?
-    event.returnValue = valueToMeta processId, routingId, window
+    window = BrowserWindow.fromWebContents event.sender
+    window = BrowserWindow.fromDevToolsWebContents event.sender unless window?
+    event.returnValue = valueToMeta event.sender, window
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_CONSTRUCTOR', (event, processId, routingId, id, args) ->
+ipc.on 'ATOM_BROWSER_CONSTRUCTOR', (event, id, args) ->
   try
-    args = unwrapArgs processId, routingId, args
+    args = unwrapArgs event.sender, args
     constructor = objectsRegistry.get id
     # Call new with array of arguments.
     # http://stackoverflow.com/questions/1606797/use-of-apply-with-new-operator-is-this-possible
     obj = new (Function::bind.apply(constructor, [null].concat(args)))
-    event.returnValue = valueToMeta processId, routingId, obj
+    event.returnValue = valueToMeta event.sender, obj
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_FUNCTION_CALL', (event, processId, routingId, id, args) ->
+ipc.on 'ATOM_BROWSER_FUNCTION_CALL', (event, id, args) ->
   try
-    args = unwrapArgs processId, routingId, args
+    args = unwrapArgs event.sender, args
     func = objectsRegistry.get id
-    callFunction event, processId, routingId, func, global, args
+    callFunction event, func, global, args
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_MEMBER_CONSTRUCTOR', (event, processId, routingId, id, method, args) ->
+ipc.on 'ATOM_BROWSER_MEMBER_CONSTRUCTOR', (event, id, method, args) ->
   try
-    args = unwrapArgs processId, routingId, args
+    args = unwrapArgs event.sender, args
     constructor = objectsRegistry.get(id)[method]
     # Call new with array of arguments.
     obj = new (Function::bind.apply(constructor, [null].concat(args)))
-    event.returnValue = valueToMeta processId, routingId, obj
+    event.returnValue = valueToMeta event.sender, obj
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_MEMBER_CALL', (event, processId, routingId, id, method, args) ->
+ipc.on 'ATOM_BROWSER_MEMBER_CALL', (event, id, method, args) ->
   try
-    args = unwrapArgs processId, routingId, args
+    args = unwrapArgs event.sender, args
     obj = objectsRegistry.get id
-    callFunction event, processId, routingId, obj[method], obj, args
+    callFunction event, obj[method], obj, args
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_MEMBER_SET', (event, processId, routingId, id, name, value) ->
+ipc.on 'ATOM_BROWSER_MEMBER_SET', (event, id, name, value) ->
   try
     obj = objectsRegistry.get id
     obj[name] = value
@@ -148,12 +148,12 @@ ipc.on 'ATOM_BROWSER_MEMBER_SET', (event, processId, routingId, id, name, value)
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_MEMBER_GET', (event, processId, routingId, id, name) ->
+ipc.on 'ATOM_BROWSER_MEMBER_GET', (event, id, name) ->
   try
     obj = objectsRegistry.get id
-    event.returnValue = valueToMeta processId, routingId, obj[name]
+    event.returnValue = valueToMeta event.sender, obj[name]
   catch e
     event.returnValue = errorToMeta e
 
-ipc.on 'ATOM_BROWSER_DEREFERENCE', (processId, routingId, storeId) ->
-  objectsRegistry.remove processId, routingId, storeId
+ipc.on 'ATOM_BROWSER_DEREFERENCE', (event, storeId) ->
+  objectsRegistry.remove event.sender.getId(), storeId
diff --git a/atom/browser/native_window.cc b/atom/browser/native_window.cc
index e4627d2ec2eb..7e54870bd64d 100644
--- a/atom/browser/native_window.cc
+++ b/atom/browser/native_window.cc
@@ -8,13 +8,10 @@
 #include <utility>
 #include <vector>
 
-#include "atom/browser/api/atom_browser_bindings.h"
 #include "atom/browser/atom_browser_context.h"
-#include "atom/browser/atom_browser_main_parts.h"
 #include "atom/browser/atom_javascript_dialog_manager.h"
 #include "atom/browser/browser.h"
 #include "atom/browser/devtools_delegate.h"
-#include "atom/browser/devtools_web_contents_observer.h"
 #include "atom/browser/ui/file_dialog.h"
 #include "atom/browser/window_list.h"
 #include "atom/common/api/api_messages.h"
@@ -195,12 +192,8 @@ bool NativeWindow::HasModalDialog() {
 void NativeWindow::OpenDevTools() {
   if (devtools_window_) {
     devtools_window_->Focus(true);
-    devtools_web_contents_observer_.reset(new DevToolsWebContentsObserver(
-        this, devtools_window_->GetWebContents()));
   } else {
     inspectable_web_contents()->ShowDevTools();
-    devtools_web_contents_observer_.reset(new DevToolsWebContentsObserver(
-        this, GetDevToolsWebContents()));
 #if defined(OS_MACOSX)
     // Temporary fix for flashing devtools, try removing this after upgraded to
     // Chrome 32.
@@ -229,11 +222,6 @@ void NativeWindow::InspectElement(int x, int y) {
   agent->InspectElement(x, y);
 }
 
-void NativeWindow::ExecuteJavaScriptInDevTools(const std::string& script) {
-  GetDevToolsWebContents()->GetRenderViewHost()->ExecuteJavascriptInWebFrame(
-      string16(), base::UTF8ToUTF16(script));
-}
-
 void NativeWindow::FocusOnWebView() {
   GetWebContents()->GetRenderViewHost()->Focus();
 }
@@ -305,14 +293,6 @@ void NativeWindow::DestroyWebContents() {
   if (!inspectable_web_contents_)
     return;
 
-  // The OnRenderViewDeleted is not called when the WebContents is destroyed
-  // directly (e.g. when closing the window), so we make sure it's always
-  // emitted to users by sending it before window is closed..
-  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
-                    OnRenderViewDeleted(
-                        GetWebContents()->GetRenderProcessHost()->GetID(),
-                        GetWebContents()->GetRoutingID()));
-
   inspectable_web_contents_.reset();
 }
 
@@ -437,13 +417,6 @@ void NativeWindow::DeactivateContents(content::WebContents* contents) {
   BlurWebView();
 }
 
-void NativeWindow::LoadingStateChanged(content::WebContents* source) {
-  bool is_loading = source->IsLoading();
-  FOR_EACH_OBSERVER(NativeWindowObserver,
-                    observers_,
-                    OnLoadingStateChanged(is_loading));
-}
-
 void NativeWindow::MoveContents(content::WebContents* source,
                                 const gfx::Rect& pos) {
   SetPosition(pos.origin());
@@ -482,16 +455,6 @@ void NativeWindow::RendererResponsive(content::WebContents* source) {
   FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnRendererResponsive());
 }
 
-void NativeWindow::RenderViewDeleted(content::RenderViewHost* rvh) {
-  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
-                    OnRenderViewDeleted(rvh->GetProcess()->GetID(),
-                                        rvh->GetRoutingID()));
-}
-
-void NativeWindow::RenderProcessGone(base::TerminationStatus status) {
-  FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnRendererCrashed());
-}
-
 void NativeWindow::BeforeUnloadFired(const base::TimeTicks& proceed_time) {
   // Do nothing, we override this method just to avoid compilation error since
   // there are two virtual functions named BeforeUnloadFired.
@@ -500,9 +463,6 @@ void NativeWindow::BeforeUnloadFired(const base::TimeTicks& proceed_time) {
 bool NativeWindow::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(NativeWindow, message)
-    IPC_MESSAGE_HANDLER(AtomViewHostMsg_Message, OnRendererMessage)
-    IPC_MESSAGE_HANDLER_DELAY_REPLY(AtomViewHostMsg_Message_Sync,
-                                    OnRendererMessageSync)
     IPC_MESSAGE_HANDLER(AtomViewHostMsg_UpdateDraggableRegions,
                         UpdateDraggableRegions)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -628,28 +588,8 @@ void NativeWindow::CallDevToolsFunction(const std::string& function_name,
       }
     }
   }
-  ExecuteJavaScriptInDevTools(function_name + "(" + params + ");");
-}
-
-void NativeWindow::OnRendererMessage(const string16& channel,
-                                     const base::ListValue& args) {
-  AtomBrowserMainParts::Get()->atom_bindings()->OnRendererMessage(
-      GetWebContents()->GetRenderProcessHost()->GetID(),
-      GetWebContents()->GetRoutingID(),
-      channel,
-      args);
-}
-
-void NativeWindow::OnRendererMessageSync(const string16& channel,
-                                         const base::ListValue& args,
-                                         IPC::Message* reply_msg) {
-  AtomBrowserMainParts::Get()->atom_bindings()->OnRendererMessageSync(
-      GetWebContents()->GetRenderProcessHost()->GetID(),
-      GetWebContents()->GetRoutingID(),
-      channel,
-      args,
-      GetWebContents(),
-      reply_msg);
+  GetDevToolsWebContents()->GetRenderViewHost()->ExecuteJavascriptInWebFrame(
+      string16(), base::UTF8ToUTF16(function_name + "(" + params + ");"));
 }
 
 }  // namespace atom
diff --git a/atom/browser/native_window.h b/atom/browser/native_window.h
index f10e509e4e92..1d638063c267 100644
--- a/atom/browser/native_window.h
+++ b/atom/browser/native_window.h
@@ -46,7 +46,6 @@ namespace atom {
 
 class AtomJavaScriptDialogManager;
 class DevToolsDelegate;
-class DevToolsWebContentsObserver;
 struct DraggableRegion;
 
 class NativeWindow : public brightray::DefaultWebContentsDelegate,
@@ -136,7 +135,6 @@ class NativeWindow : public brightray::DefaultWebContentsDelegate,
   virtual void CloseDevTools();
   virtual bool IsDevToolsOpened();
   virtual void InspectElement(int x, int y);
-  virtual void ExecuteJavaScriptInDevTools(const std::string& script);
 
   virtual void FocusOnWebView();
   virtual void BlurWebView();
@@ -220,7 +218,6 @@ class NativeWindow : public brightray::DefaultWebContentsDelegate,
   virtual bool CanOverscrollContent() const OVERRIDE;
   virtual void ActivateContents(content::WebContents* contents) OVERRIDE;
   virtual void DeactivateContents(content::WebContents* contents) OVERRIDE;
-  virtual void LoadingStateChanged(content::WebContents* source) OVERRIDE;
   virtual void MoveContents(content::WebContents* source,
                             const gfx::Rect& pos) OVERRIDE;
   virtual void CloseContents(content::WebContents* source) OVERRIDE;
@@ -230,8 +227,6 @@ class NativeWindow : public brightray::DefaultWebContentsDelegate,
   virtual void RendererResponsive(content::WebContents* source) OVERRIDE;
 
   // Implementations of content::WebContentsObserver.
-  virtual void RenderViewDeleted(content::RenderViewHost*) OVERRIDE;
-  virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
   virtual void BeforeUnloadFired(const base::TimeTicks& proceed_time) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
@@ -274,13 +269,6 @@ class NativeWindow : public brightray::DefaultWebContentsDelegate,
                          bool succeed,
                          const SkBitmap& bitmap);
 
-  void OnRendererMessage(const string16& channel,
-                         const base::ListValue& args);
-
-  void OnRendererMessageSync(const string16& channel,
-                             const base::ListValue& args,
-                             IPC::Message* reply_msg);
-
   // Notification manager.
   content::NotificationRegistrar registrar_;
 
@@ -305,9 +293,6 @@ class NativeWindow : public brightray::DefaultWebContentsDelegate,
   base::WeakPtr<NativeWindow> devtools_window_;
   scoped_ptr<DevToolsDelegate> devtools_delegate_;
 
-  // WebContentsObserver for the WebContents of devtools.
-  scoped_ptr<DevToolsWebContentsObserver> devtools_web_contents_observer_;
-
   scoped_ptr<AtomJavaScriptDialogManager> dialog_manager_;
 
   // Notice that inspectable_web_contents_ must be placed after dialog_manager_,
diff --git a/atom/browser/native_window_observer.h b/atom/browser/native_window_observer.h
index 5d697480050f..a7cb41fdaeea 100644
--- a/atom/browser/native_window_observer.h
+++ b/atom/browser/native_window_observer.h
@@ -17,9 +17,6 @@ class NativeWindowObserver {
   virtual void OnPageTitleUpdated(bool* prevent_default,
                                   const std::string& title) {}
 
-  // Called when the window is starting or is done loading a page.
-  virtual void OnLoadingStateChanged(bool is_loading) {}
-
   // Called when the window is gonna closed.
   virtual void WillCloseWindow(bool* prevent_default) {}
 
@@ -34,12 +31,6 @@ class NativeWindowObserver {
 
   // Called when renderer recovers.
   virtual void OnRendererResponsive() {}
-
-  // Called when a render view has been deleted.
-  virtual void OnRenderViewDeleted(int process_id, int routing_id) {}
-
-  // Called when renderer has crashed.
-  virtual void OnRendererCrashed() {}
 };
 
 }  // namespace atom
diff --git a/atom/common/api/atom_extensions.h b/atom/common/api/atom_extensions.h
index 5bba348c0ed4..62a0826403c5 100644
--- a/atom/common/api/atom_extensions.h
+++ b/atom/common/api/atom_extensions.h
@@ -12,7 +12,6 @@ NODE_EXT_LIST_START
 NODE_EXT_LIST_ITEM(atom_browser_app)
 NODE_EXT_LIST_ITEM(atom_browser_auto_updater)
 NODE_EXT_LIST_ITEM(atom_browser_dialog)
-NODE_EXT_LIST_ITEM(atom_browser_ipc)
 NODE_EXT_LIST_ITEM(atom_browser_menu)
 NODE_EXT_LIST_ITEM(atom_browser_power_monitor)
 NODE_EXT_LIST_ITEM(atom_browser_protocol)
diff --git a/atom/renderer/api/lib/ipc.coffee b/atom/renderer/api/lib/ipc.coffee
index 545e6a2168a8..3d4ec30ba356 100644
--- a/atom/renderer/api/lib/ipc.coffee
+++ b/atom/renderer/api/lib/ipc.coffee
@@ -10,15 +10,13 @@ class Ipc extends EventEmitter
       process.removeAllListeners 'ATOM_INTERNAL_MESSAGE'
 
   send: (args...) ->
-    @sendChannel 'message', args...
-
-  sendChannel: (args...) ->
-    ipc.send 'ATOM_INTERNAL_MESSAGE', [args...]
+    ipc.send 'ipc-message', [args...]
 
   sendSync: (args...) ->
-    @sendSync 'sync-message', args...
+    JSON.parse ipc.sendSync('ipc-message-sync', [args...])
 
-  sendChannelSync: (args...) ->
-    JSON.parse ipc.sendSync('ATOM_INTERNAL_MESSAGE_SYNC', [args...])
+  # Discarded
+  sendChannel: -> @send.apply this, arguments
+  sendChannelSync: -> @sendSync.apply this, arguments
 
 module.exports = new Ipc
diff --git a/docs/api/browser/browser-window.md b/docs/api/browser/browser-window.md
index ae25fd0389ce..19fcb2591aa5 100644
--- a/docs/api/browser/browser-window.md
+++ b/docs/api/browser/browser-window.md
@@ -7,7 +7,7 @@ example is:
 var BrowserWindow = require('browser-window');
 
 var win = new BrowserWindow({ width: 800, height: 600, show: false });
-win.on('destroyed', function() {
+win.on('closed', function() {
   win = null;
 });
 
@@ -86,13 +86,6 @@ you should explictly set `sandbox` to `none`:
 Emitted when the document changed its title, calling `event.preventDefault()`
 would prevent the native window's title to change.
 
-### Event: 'loading-state-changed'
-
-* `event` Event
-* `isLoading` Boolean
-
-Emitted when the window is starting or is done loading a page.
-
 ### Event: 'close'
 
 * `event` Event
@@ -137,10 +130,6 @@ Emiited when the web page becomes unresponsive.
 
 Emitted when the unresponsive web page becomes responsive again.
 
-### Event: 'crashed'
-
-Emitted when the renderer process is crashed.
-
 ### Event: 'blur'
 
 Emiited when window loses focus.
@@ -153,12 +142,20 @@ Returns an array of all opened browser windows.
 
 Returns the window that is focused in this application.
 
-### Class Method: BrowserWindow.fromProcessIdAndRoutingId(processId, routingId)
+### Class Method: BrowserWindow.fromWebContents(webContents)
 
-* `processId` Integer
-* `routingId` Integer
+* `webContents` WebContents
 
-Find a window according to its `processId` and `routingId`.
+Find a window according to the `webContents` it owns
+
+### BrowserWindow.webContents
+
+The `WebContents` object this window owns, all web page related events and
+operations would be done via it.
+
+### BrowserWindow.devToolsWebContents
+
+Get the `WebContents` of devtools of this window.
 
 ### BrowserWindow.destroy()
 
@@ -334,13 +331,6 @@ Closes the developer tools.
 
 Starts inspecting element at position (`x`, `y`).
 
-### BrowserWindow.executeJavaScriptInDevTools(code)
-
-* `code` String
-
-Evaluate `code` in devtools to use
-[InspectorFrontendAPI](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/devtools/front_end/InspectorFrontendAPI.js&q=InspectorFrontendAPI&sq=package:chromium&type=cs)
-
 ### BrowserWindow.focusOnWebView()
 
 ### BrowserWindow.blurWebView()
@@ -366,82 +356,113 @@ encode it and use data URL to embed the image in HTML.
 [remote](../renderer/remote.md) if you are going to use this API in renderer
 process.
 
-### BrowserWindow.getPageTitle()
-
-Returns the title of web page.
-
-### BrowserWindow.isLoading()
-
-Returns whether web page is still loading resources.
-
-### BrowserWindow.isWaitingForResponse()
-
-Returns whether web page is waiting for a first-response for the main resource
-of the page.
-
-### BrowserWindow.stop()
-
-Stops any pending navigation.
-
-### BrowserWindow.getProcessId()
-
-Returns window's process ID. The process ID and routing ID can be used
-together to locate a window.
-
-### BrowserWindow.getRoutingId()
-
-Returns window's routing ID. The process ID and routing ID can be used
-together to locate a window.
-
 ### BrowserWindow.loadUrl(url)
 
+Same with `webContents.loadUrl(url)`.
+
+## Class: WebContents
+
+A `WebContents` is responsible for rendering and controlling a web page.
+
+`WebContents` is an
+[EventEmitter](http://nodejs.org/api/events.html#events_class_events_eventemitter).
+
+### Event: 'crashed'
+
+Emitted when the renderer process is crashed.
+
+### Event: 'did-finish-load'
+
+Emitted when the navigation is done, i.e. the spinner of the tab will stop
+spinning, and the onload event was dispatched.
+
+### Event: 'did-start-loading'
+
+### Event: 'did-stop-loading'
+
+### WebContents.loadUrl(url)
+
 * `url` URL
 
 Loads the `url` in the window, the `url` must contains the protocol prefix,
 e.g. the `http://` or `file://`.
 
-### BrowserWindow.getUrl()
+### WebContents.getUrl()
 
 Returns URL of current web page.
 
-### BrowserWindow.canGoBack()
+### WebContents.getTitle()
+
+Returns the title of web page.
+
+### WebContents.isLoading()
+
+Returns whether web page is still loading resources.
+
+### WebContents.isWaitingForResponse()
+
+Returns whether web page is waiting for a first-response for the main resource
+of the page.
+
+### WebContents.stop()
+
+Stops any pending navigation.
+
+### WebContents.reload()
+
+Reloads current page.
+
+### WebContents.reloadIgnoringCache()
+
+Reloads current page and ignores cache.
+
+### WebContents.canGoBack()
 
 Returns whether the web page can go back.
 
-### BrowserWindow.canGoForward()
+### WebContents.canGoForward()
 
 Returns whether the web page can go forward.
 
-### BrowserWindow.canGoToOffset(offset)
+### WebContents.canGoToOffset(offset)
 
 * `offset` Integer
 
 Returns whether the web page can go to `offset`.
 
-### BrowserWindow.goBack()
+### WebContents.goBack()
 
 Makes the web page go back.
 
-### BrowserWindow.goForward()
+### WebContents.goForward()
 
 Makes the web page go forward.
 
-### BrowserWindow.goToIndex(index)
+### WebContents.goToIndex(index)
 
 * `index` Integer
 
 Navigates to the specified absolute index.
 
-### BrowserWindow.goToOffset(offset)
+### WebContents.goToOffset(offset)
 
 * `offset` Integer
 
 Navigates to the specified offset from the "current entry".
 
-### BrowserWindow.reload()
+### WebContents.IsCrashed()
 
-Reloads current window.
+Whether the renderer process has crashed.
 
-### BrowserWindow.reloadIgnoringCache()
+### WebContents.executeJavaScript(code)
 
-Reloads current window and ignores cache.
+* `code` String
+
+Evaluate `code` in page.
+
+### WebContents.send(channel[, args...])
+
+* `channel` String
+
+Send `args..` to the web page via `channel` in asynchronous message, the web
+page can handle it by listening to the `channel` event of `ipc` module.
diff --git a/docs/api/browser/ipc-browser.md b/docs/api/browser/ipc-browser.md
index 2edaa29463ae..534a7a2a075c 100644
--- a/docs/api/browser/ipc-browser.md
+++ b/docs/api/browser/ipc-browser.md
@@ -1,52 +1,45 @@
 # ipc (browser)
 
-The `ipc` module allows developers to send asynchronous messages to renderers.
-To avoid possible dead-locks, it's not allowed to send synchronous messages in
-browser.
+Handles asynchronous and synchronous message sent from web page.
 
-## Event: 'message'
+The messages sent from web page would be emitted to this module, the event name
+is the `channel` when sending message. To reply a synchronous message, you need
+to set `event.returnValue`, to send an asynchronous back to the sender, you can
+use `event.sender.send(...)`.
 
-* `processId` Integer
-* `routingId` Integer
-
-Emitted when renderer sent a message to the browser.
-
-## Event: 'sync-message'
-
-* `event` Object
-* `processId` Integer
-* `routingId` Integer
-
-Emitted when renderer sent a synchronous message to the browser. The receiver
-should store the result in `event.returnValue`.
-
-**Note:** Due to the limitation of `EventEmitter`, returning value in the
-event handler has no effect, so we have to store the result by using the
-`event` parameter.
-
-## ipc.send(processId, routingId, [args...])
-
-* `processId` Integer
-* `routingId` Integer
-
-Send `args...` to the renderer specified by `processId` and `routingId` and
-return immediately, the renderer should handle the message by listening to the
-`message` event.
-
-## ipc.sendChannel(processId, routingId, channel, [args...])
-
-* `processId` Integer
-* `routingId` Integer
-* `channel` String
-
-This is the same with ipc.send, except that the renderer should listen to the
-`channel` event. The ipc.send(processId, routingId, args...) can be seen as
-ipc.sendChannel(processId, routingId, 'message', args...).
-
-**Note:** If the the first argument (e.g. `processId`) is a `BrowserWindow`,
-`ipc.sendChannel` would automatically get the `processId` and `routingId`
-from it, so you can send a message to window like this:
+An example of sending and handling messages:
 
 ```javascript
-ipc.sendChannel(browserWindow, 'message', ...);
+// In browser.
+var ipc = require('ipc');
+ipc.on('asynchronous-message', function(event, arg) {
+  console.log(arg);  // prints "ping"
+  event.sender.send('asynchronous-reply', 'pong');
+});
+
+ipc.on('synchronous-message', function(event, arg) {
+  console.log(arg);  // prints "ping"
+  event.returnValue = 'pong'.
+});
 ```
+
+```javascript
+// In web page.
+var ipc = require('ipc');
+console.log(ipc.sendSync('synchronous-message', 'ping')); // prints "pong"
+
+ipc.on('asynchronous-reply', function(arg) {
+  console.log(arg); // prints "pong"
+});
+ipc.send('asynchronous-message', 'ping');
+```
+
+### Class: Event
+
+## Event.returnValue
+
+Assign to this to return an value to synchronous messages.
+
+## Event.sender
+
+The `WebContents` of the web page that has sent the message.
diff --git a/docs/api/renderer/ipc-renderer.md b/docs/api/renderer/ipc-renderer.md
index 4076b93b395e..5c101269d45e 100644
--- a/docs/api/renderer/ipc-renderer.md
+++ b/docs/api/renderer/ipc-renderer.md
@@ -5,75 +5,18 @@ asynchronous messages to the browser, and also receive messages sent from
 browser. If you want to make use of modules of browser from renderer, you
 might consider using the [remote](remote.md) module.
 
-An example of echoing messages between browser and renderer:
+See [ipc (browser)](../browser/ipc-browser.md) for examples.
 
-```javascript
-// In browser:
-var ipc = require('ipc');
-ipc.on('message', function(processId, routingId, m) {
-  ipc.send(processId, routingId, m);
-});
-```
+## ipc.send(channel[, args...])
 
-```javascript
-// In renderer:
-var ipc = require('ipc');
-ipc.on('message', function(m) {
-  console.log('Received message', m);
-});
-ipc.send('Hello world');
-```
+Send `args..` to the web page via `channel` in asynchronous message, the browser
+process can handle it by listening to the `channel` event of `ipc` module.
 
-An example of sending synchronous message from renderer to browser:
+## ipc.sendSync(channel[, args...])
 
-```javascript
-// In browser:
-var ipc = require('ipc');
-ipc.on('browser-data-request', function(event, processId, routingId, message) {
-  event.returnValue = 'THIS SOME DATA FROM THE BROWSER';
-});
-```
-
-```javascript
-// In renderer:
-var ipc = require('ipc');
-console.log(ipc.sendChannelSync('browser-data-request', 'THIS IS FROM THE RENDERER'));
-```
-
-## Event: 'message'
-
-Emitted when browser sent a message to this window.
-
-## ipc.send([args...])
-
-Send all arguments to the browser and return immediately, the browser should
-handle the message by listening to the `message` event.
-
-## ipc.sendSync([args...])
-
-Send all arguments to the browser synchronously, and returns the result sent
-from browser. The browser should handle the message by listening to the
-`sync-message` event.
+Send `args..` to the web page via `channel` in synchronous message, and returns
+the result sent from browser. The browser process can handle it by listening to
+the `channel` event of `ipc` module, and returns by setting `event.returnValue`.
 
 **Note:** Usually developers should never use this API, since sending
-synchronous message would block the browser.
-
-## ipc.sendChannel(channel, [args...])
-
-* `channel` String
-
-This is the same with `ipc.send`, except that the browser should listen to the
-`channel` event. The `ipc.send(args...)` can be seen as
-`ipc.sendChannel('message', args...)`.
-
-
-## ipc.sendChannelSync(channel, [args...])
-
-* `channel` String
-
-This is the same with `ipc.sendSync`, except that the browser should listen to
-the `channel` event. The `ipc.sendSync(args...)` can be seen as
-`ipc.sendChannelSync('sync-message', args...)`.
-
-**Note:** Usually developers should never use this API, since sending
-synchronous message would block the browser.
+synchronous message would block the whole web page.
diff --git a/spec/api-browser-window-spec.coffee b/spec/api-browser-window-spec.coffee
index 343ba4645bab..87e3a5249cda 100644
--- a/spec/api-browser-window-spec.coffee
+++ b/spec/api-browser-window-spec.coffee
@@ -18,9 +18,8 @@ describe 'browser-window module', ->
 
   describe 'BrowserWindow.close()', ->
     it 'should emit unload handler', (done) ->
-      w.on 'loading-state-changed', (event, isLoading) ->
-        if (!isLoading)
-          w.close()
+      w.webContents.on 'did-finish-load', ->
+        w.close()
       w.on 'closed', ->
         test = path.join(fixtures, 'api', 'unload')
         content = fs.readFileSync(test)
@@ -32,9 +31,8 @@ describe 'browser-window module', ->
     it 'should emit beforeunload handler', (done) ->
       w.on 'onbeforeunload', ->
         done()
-      w.on 'loading-state-changed', (event, isLoading) ->
-        if (!isLoading)
-          w.close()
+      w.webContents.on 'did-finish-load', ->
+        w.close()
       w.loadUrl 'file://' + path.join(fixtures, 'api', 'beforeunload-false.html')
 
   describe 'window.close()', ->
@@ -53,18 +51,9 @@ describe 'browser-window module', ->
       w.loadUrl 'file://' + path.join(fixtures, 'api', 'close-beforeunload-false.html')
 
   describe 'BrowserWindow.loadUrl(url)', ->
-    it 'should emit loading-state-changed event', (done) ->
-      count = 0
-      w.on 'loading-state-changed', (event, isLoading) ->
-        if count == 0
-          assert.equal isLoading, true
-        else if count == 1
-          assert.equal isLoading, false
-          done()
-        else
-          assert false
-
-        ++count
+    it 'should emit did-start-loading event', (done) ->
+      w.webContents.on 'did-start-loading', ->
+        done()
       w.loadUrl 'about:blank'
 
   describe 'BrowserWindow.focus()', ->
diff --git a/spec/api-ipc-spec.coffee b/spec/api-ipc-spec.coffee
index 1116d1bce280..1529e178f503 100644
--- a/spec/api-ipc-spec.coffee
+++ b/spec/api-ipc-spec.coffee
@@ -48,13 +48,13 @@ describe 'ipc module', ->
       print_name = remote.require path.join(fixtures, 'module', 'print_name.js')
       assert.equal print_name.print(buf), 'Buffer'
 
-  describe 'ipc.send', ->
+  describe 'ipc.sender.send', ->
     it 'should work when sending an object containing id property', (done) ->
       obj = id: 1, name: 'ly'
       ipc.once 'message', (message) ->
         assert.deepEqual message, obj
         done()
-      ipc.send obj
+      ipc.send 'message', obj
 
   describe 'ipc.sendSync', ->
     it 'can be replied by setting event.returnValue', ->
diff --git a/spec/static/main.js b/spec/static/main.js
index 6ec1cf1b892b..5d11ed04ffa5 100644
--- a/spec/static/main.js
+++ b/spec/static/main.js
@@ -8,8 +8,8 @@ var window = null;
 
 app.commandLine.appendSwitch('js-flags', '--expose_gc');
 
-ipc.on('message', function() {
-  ipc.send.apply(this, arguments);
+ipc.on('message', function(event, arg) {
+  event.sender.send('message', arg);
 });
 
 ipc.on('console.log', function(pid, rid, args) {
@@ -24,11 +24,11 @@ ipc.on('process.exit', function(pid, rid, code) {
   process.exit(code);
 });
 
-ipc.on('eval', function(ev, pid, rid, script) {
+ipc.on('eval', function(ev, script) {
   ev.returnValue = eval(script);
 });
 
-ipc.on('echo', function(ev, pid, rid, msg) {
+ipc.on('echo', function(ev, msg) {
   ev.returnValue = msg;
 });