code cleanup

atom/browser/api/atom_api_web_contents.cc

@@ -248,8 +248,8 @@ WebContents::WebContents(v8::Isolate* isolate,
                          content::WebContents* web_contents,
                          Type type)
     : content::WebContentsObserver(web_contents),
-      zoom_controller_(nullptr),
       embedder_(nullptr),
+      zoom_controller_(nullptr),
       type_(type),
       request_id_(0),
       background_throttling_(true),
@@ -267,8 +267,8 @@ WebContents::WebContents(v8::Isolate* isolate,
 }
 
 WebContents::WebContents(v8::Isolate* isolate, const mate::Dictionary& options)
-    : zoom_controller_(nullptr),
-      embedder_(nullptr),
+    : embedder_(nullptr),
+      zoom_controller_(nullptr),
       type_(BROWSER_WINDOW),
       request_id_(0),
       background_throttling_(true),
@@ -354,7 +354,7 @@ void WebContents::InitWithSessionAndOptions(v8::Isolate* isolate,
   WebContentsZoomController::CreateForWebContents(web_contents);
   zoom_controller_ = WebContentsZoomController::FromWebContents(web_contents);
   double zoom_factor;
-  if (options.Get("zoomFactor", &zoom_factor))
+  if (options.Get(options::kZoomFactor, &zoom_factor))
     zoom_controller_->SetDefaultZoomFactor(zoom_factor);
 
   web_contents->SetUserAgentOverride(GetBrowserContext()->GetUserAgent());

atom/browser/api/atom_api_web_view_manager.cc

@@ -8,6 +8,7 @@
 #include "atom/common/native_mate_converters/content_converter.h"
 #include "atom/common/native_mate_converters/value_converter.h"
 #include "atom/common/node_includes.h"
+#include "atom/common/options_switches.h"
 #include "content/public/browser/browser_context.h"
 #include "native_mate/dictionary.h"
 
@@ -26,7 +27,7 @@ void AddGuest(int guest_instance_id,
                       guest_web_contents);
 
   double zoom_factor;
-  if (options.GetDouble("zoomFactor", &zoom_factor)) {
+  if (options.GetDouble(atom::options::kZoomFactor, &zoom_factor)) {
     atom::WebContentsZoomController::FromWebContents(guest_web_contents)
         ->SetDefaultZoomFactor(zoom_factor);
   }

atom/browser/web_contents_zoom_controller.cc

@@ -7,7 +7,6 @@
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/navigation_handle.h"
-#include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
@@ -31,9 +30,7 @@ WebContentsZoomController::WebContentsZoomController(
       &WebContentsZoomController::OnZoomLevelChanged, base::Unretained(this)));
 }
 
-WebContentsZoomController::~WebContentsZoomController() {
-  embedder_zoom_controller_ = nullptr;
-}
+WebContentsZoomController::~WebContentsZoomController() {}
 
 void WebContentsZoomController::AddObserver(
     WebContentsZoomController::Observer* observer) {
@@ -72,8 +69,8 @@ void WebContentsZoomController::SetZoomLevel(double level) {
       host_zoom_factor_[host] = new_zoom_factor;
     content::HostZoomMap::SetZoomLevel(web_contents(), level);
     // Notify observers of zoom level changes.
-    FOR_EACH_OBSERVER(WebContentsZoomController::Observer, observers_,
-                      OnZoomLevelChanged(web_contents(), level, false));
+    for (Observer& observer : observers_)
+      observer.OnZoomLevelChanged(web_contents(), level, false);
   }
 }
 
@@ -94,8 +91,8 @@ void WebContentsZoomController::SetTemporaryZoomLevel(double level) {
   old_view_id_ = web_contents()->GetRenderViewHost()->GetRoutingID();
   host_zoom_map_->SetTemporaryZoomLevel(old_process_id_, old_view_id_, level);
   // Notify observers of zoom level changes.
-  FOR_EACH_OBSERVER(WebContentsZoomController::Observer, observers_,
-                    OnZoomLevelChanged(web_contents(), level, true));
+  for (Observer& observer : observers_)
+    observer.OnZoomLevelChanged(web_contents(), level, true);
 }
 
 bool WebContentsZoomController::UsesTemporaryZoomLevel() {
@@ -122,6 +119,7 @@ void WebContentsZoomController::DidFinishNavigation(
 void WebContentsZoomController::WebContentsDestroyed() {
   observers_.Clear();
   host_zoom_factor_.clear();
+  embedder_zoom_controller_ = nullptr;
 }
 
 void WebContentsZoomController::RenderFrameHostChanged(

atom/browser/web_view_guest_delegate.cc

@@ -23,11 +23,11 @@ const int kDefaultHeight = 300;
 }  // namespace
 
 WebViewGuestDelegate::WebViewGuestDelegate()
-    : guest_host_(nullptr),
+    : embedder_zoom_controller_(nullptr),
+      guest_host_(nullptr),
       auto_size_enabled_(false),
       is_full_page_plugin_(false),
-      api_web_contents_(nullptr) {
-}
+      api_web_contents_(nullptr) {}
 
 WebViewGuestDelegate::~WebViewGuestDelegate() {
 }
@@ -39,9 +39,11 @@ void WebViewGuestDelegate::Initialize(api::WebContents* api_web_contents) {
 
 void WebViewGuestDelegate::Destroy() {
   // Give the content module an opportunity to perform some cleanup.
-  embedder_zoom_controller_->RemoveObserver(this);
+  if (embedder_zoom_controller_) {
+    embedder_zoom_controller_->RemoveObserver(this);
+    embedder_zoom_controller_ = nullptr;
+  }
   guest_host_->WillDestroy();
-  embedder_zoom_controller_ = nullptr;
   guest_host_ = nullptr;
 }
 

atom/common/options_switches.cc

@@ -155,7 +155,6 @@ const char kAppUserModelId[] = "app-user-model-id";
 
 // The command line switch versions of the options.
 const char kBackgroundColor[]  = "background-color";
-const char kZoomFactor[]       = "zoom-factor";
 const char kPreloadScript[]    = "preload";
 const char kPreloadURL[]       = "preload-url";
 const char kNodeIntegration[]  = "node-integration";

atom/common/options_switches.h

@@ -81,7 +81,6 @@ extern const char kSecureSchemes[];
 extern const char kAppUserModelId[];
 
 extern const char kBackgroundColor[];
-extern const char kZoomFactor[];
 extern const char kPreloadScript[];
 extern const char kPreloadURL[];
 extern const char kNodeIntegration[];

atom/renderer/api/atom_api_web_frame.cc

@@ -73,7 +73,7 @@ void WebFrame::SetName(const std::string& name) {
 }
 
 double WebFrame::SetZoomLevel(double level) {
-  double result;
+  double result = 0.0;
   content::RenderView* render_view =
       content::RenderView::FromWebView(web_frame_->view());
   render_view->Send(new AtomViewHostMsg_SetTemporaryZoomLevel(
@@ -82,7 +82,7 @@ double WebFrame::SetZoomLevel(double level) {
 }
 
 double WebFrame::GetZoomLevel() const {
-  double result;
+  double result = 0.0;
   content::RenderView* render_view =
       content::RenderView::FromWebView(web_frame_->view());
   render_view->Send(