[DevTools] Use device metrics emulation implemented in content.

public/web/WebViewClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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     // This method enumerates all the files in the path. It returns immediately
     // and asynchronously invokes the WebFileChooserCompletion with all the
     // files in the directory. Returns false if the WebFileChooserCompletion
     // will never be called.
     virtual bool enumerateChosenDirectory(const WebString& path, WebFileChooserCompletion*) { return false; }
 
     // Creates the main WebFrame for the specified WebHelperPlugin.
     // Called by WebHelperPlugin to provide the WebFrameClient interface for the WebFrame.
     virtual void initializeHelperPluginWebFrame(WebHelperPlugin*) { }
 
-
     // Navigational --------------------------------------------------------
 
     // These notifications bracket any loading that occurs in the WebView.
     virtual void didStartLoading() { }
     virtual void didStopLoading() { }
 
     // Notification that some progress was made loading the current page.
     // loadProgress is a value between 0 (nothing loaded) and 1.0 (frame fully
     // loaded).
     virtual void didChangeLoadProgress(WebFrame*, double loadProgress) { }
@@ skipping 240 matching lines @@
     // Informs the browser that the draggable regions have been updated.
     virtual void draggableRegionsChanged() { }
 
 protected:
     ~WebViewClient() { }
 };
 
 } // namespace WebKit
 
 #endif