Fix pushState causing stop/reload button and favicon to flicker.

content/renderer/render_frame_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 83 matching lines @@
   // This is called right after creation with the WebFrame for this RenderFrame.
   void SetWebFrame(blink::WebFrame* web_frame);
 
   // Notification from RenderView.
   virtual void OnStop();
 
   // Start/Stop loading notifications.
   // TODO(nasko): Those are page-level methods at this time and come from
   // WebViewClient. We should move them to be WebFrameClient calls and put
   // logic in the browser side to balance starts/stops.
+  // |to_different_document| will be true unless the load is a fragment
+  // navigation, or triggered by history.pushState/replaceState.
   virtual void didStartLoading(bool to_different_document);
   virtual void didStopLoading();
   virtual void didChangeLoadProgress(double load_progress);
 
 #if defined(ENABLE_PLUGINS)
   // Notification that a PPAPI plugin has been created.
   void PepperPluginCreated(RendererPpapiHost* host);
 
   // Notifies that |instance| has changed the cursor.
   // This will update the cursor appearance if it is currently over the plugin
@@ skipping 365 matching lines @@
   // Used to inform didChangeSelection() when it is called in the context
   // of handling a InputMsg_SelectRange IPC.
   bool handling_select_range_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_