diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
index ac96a64d494..02ac372f876 100644
--- a/atom/browser/api/atom_api_web_contents.cc
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -109,7 +109,8 @@ content::ServiceWorkerContext* GetServiceWorkerContext(
 }  // namespace
 
 WebContents::WebContents(content::WebContents* web_contents)
-    : content::WebContentsObserver(web_contents),
+    : CommonWebContentsDelegate(false),
+      content::WebContentsObserver(web_contents),
       guest_instance_id_(-1),
       guest_opaque_(true),
       guest_host_(nullptr),
@@ -118,7 +119,8 @@ WebContents::WebContents(content::WebContents* web_contents)
 }
 
 WebContents::WebContents(const mate::Dictionary& options)
-    : guest_instance_id_(-1),
+    : CommonWebContentsDelegate(true),
+      guest_instance_id_(-1),
       guest_opaque_(true),
       guest_host_(nullptr),
       auto_size_enabled_(false),
diff --git a/atom/browser/api/atom_api_web_contents.h b/atom/browser/api/atom_api_web_contents.h
index 14de69fc903..97a433ed36c 100644
--- a/atom/browser/api/atom_api_web_contents.h
+++ b/atom/browser/api/atom_api_web_contents.h
@@ -9,7 +9,7 @@
 #include <vector>
 
 #include "atom/browser/api/event_emitter.h"
-#include "brightray/browser/default_web_contents_delegate.h"
+#include "atom/browser/common_web_contents_delegate.h"
 #include "content/public/browser/browser_plugin_guest_delegate.h"
 #include "content/public/common/favicon_url.h"
 #include "content/public/browser/web_contents_delegate.h"
@@ -51,7 +51,7 @@ struct SetSizeParams {
 
 class WebContents : public mate::EventEmitter,
                     public content::BrowserPluginGuestDelegate,
-                    public brightray::DefaultWebContentsDelegate,
+                    public CommonWebContentsDelegate,
                     public content::WebContentsObserver,
                     public content::GpuDataManagerObserver {
  public:
diff --git a/atom/browser/common_web_contents_delegate.cc b/atom/browser/common_web_contents_delegate.cc
new file mode 100644
index 00000000000..46e872384f0
--- /dev/null
+++ b/atom/browser/common_web_contents_delegate.cc
@@ -0,0 +1,16 @@
+// Copyright (c) 2015 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/common_web_contents_delegate.h"
+
+namespace atom {
+
+CommonWebContentsDelegate::CommonWebContentsDelegate(bool is_guest)
+    : is_guest_(is_guest) {
+}
+
+CommonWebContentsDelegate::~CommonWebContentsDelegate() {
+}
+
+}  // namespace atom
diff --git a/atom/browser/common_web_contents_delegate.h b/atom/browser/common_web_contents_delegate.h
new file mode 100644
index 00000000000..f449bf23b9b
--- /dev/null
+++ b/atom/browser/common_web_contents_delegate.h
@@ -0,0 +1,27 @@
+// Copyright (c) 2015 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_COMMON_WEB_CONTENTS_DELEGATE_H_
+#define ATOM_BROWSER_COMMON_WEB_CONTENTS_DELEGATE_H_
+
+#include "brightray/browser/default_web_contents_delegate.h"
+
+namespace atom {
+
+class CommonWebContentsDelegate : public brightray::DefaultWebContentsDelegate {
+ public:
+  explicit CommonWebContentsDelegate(bool is_guest);
+  virtual ~CommonWebContentsDelegate();
+
+  bool is_guest() const { return is_guest_; };
+
+ private:
+  const bool is_guest_;
+
+  DISALLOW_COPY_AND_ASSIGN(CommonWebContentsDelegate);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_COMMON_WEB_CONTENTS_DELEGATE_H_
diff --git a/atom/browser/native_window.cc b/atom/browser/native_window.cc
index c254ed96042..6c11e97e96a 100644
--- a/atom/browser/native_window.cc
+++ b/atom/browser/native_window.cc
@@ -151,7 +151,8 @@ base::DictionaryValue* CreateFileSystemValue(
 
 NativeWindow::NativeWindow(content::WebContents* web_contents,
                            const mate::Dictionary& options)
-    : content::WebContentsObserver(web_contents),
+    : CommonWebContentsDelegate(false),
+      content::WebContentsObserver(web_contents),
       has_frame_(true),
       transparent_(false),
       enable_larger_than_screen_(false),
diff --git a/atom/browser/native_window.h b/atom/browser/native_window.h
index fb614bad2bd..2cfbe135ef6 100644
--- a/atom/browser/native_window.h
+++ b/atom/browser/native_window.h
@@ -9,13 +9,13 @@
 #include <string>
 #include <vector>
 
+#include "atom/browser/common_web_contents_delegate.h"
 #include "atom/browser/native_window_observer.h"
 #include "atom/browser/ui/accelerator_util.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
-#include "brightray/browser/default_web_contents_delegate.h"
 #include "brightray/browser/inspectable_web_contents_delegate.h"
 #include "brightray/browser/inspectable_web_contents_impl.h"
 #include "content/public/browser/notification_registrar.h"
@@ -54,7 +54,7 @@ class AtomJavaScriptDialogManager;
 struct DraggableRegion;
 class WebDialogHelper;
 
-class NativeWindow : public brightray::DefaultWebContentsDelegate,
+class NativeWindow : public CommonWebContentsDelegate,
                      public brightray::InspectableWebContentsDelegate,
                      public content::WebContentsObserver,
                      public content::NotificationObserver {
diff --git a/filenames.gypi b/filenames.gypi
index 2bef3883254..6ece2ba634c 100644
--- a/filenames.gypi
+++ b/filenames.gypi
@@ -123,6 +123,8 @@
       'atom/browser/browser_mac.mm',
       'atom/browser/browser_win.cc',
       'atom/browser/browser_observer.h',
+      'atom/browser/common_web_contents_delegate.cc',
+      'atom/browser/common_web_contents_delegate.h',
       'atom/browser/javascript_environment.cc',
       'atom/browser/javascript_environment.h',
       'atom/browser/mac/atom_application.h',