pushState should not be treated as a navigation (step 1 of 3)

content/renderer/render_view_impl.h

 // Copyright (c) 2012 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_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 402 matching lines @@
       const blink::WebConsoleMessage& message,
       const blink::WebString& source_name,
       unsigned source_line,
       const blink::WebString& stack_trace);
   virtual void printPage(blink::WebFrame* frame);
   virtual blink::WebNotificationPresenter* notificationPresenter();
   virtual bool enumerateChosenDirectory(
       const blink::WebString& path,
       blink::WebFileChooserCompletion* chooser_completion);
   virtual void initializeHelperPluginWebFrame(blink::WebHelperPlugin*);
+  virtual void didStartLoading(bool to_different_document);
+  // DEPRECATED
   virtual void didStartLoading();
   virtual void didStopLoading();
   virtual void didChangeLoadProgress(blink::WebFrame* frame,
                                      double load_progress);
   virtual void didCancelCompositionOnSelectionChange();
   virtual void didChangeSelection(bool is_selection_empty);
   virtual void didExecuteCommand(const blink::WebString& command_name);
   virtual bool handleCurrentKeyboardEvent();
   virtual blink::WebColorChooser* createColorChooser(
       blink::WebColorChooserClient*,
@@ skipping 1085 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_