[DevTools] Use device metrics emulation implemented in content.

Source/web/WebDevToolsAgentPrivate.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
@@ skipping 29 matching lines @@
 
 class WebDevToolsAgentPrivate : public WebDevToolsAgent {
 public:
 
     // Notification from FrameLoaderClientImpl:
     // New context has been created for a given world in given frame. Any
     // processing hat needs to happen before the first script is evaluated
     // in this context should be done here.
     virtual void didCreateScriptContext(WebFrameImpl*, int worldId) = 0;
 
-    // A new FrameView has been created for the specified WebFrame using
-    // the Frame::createView() call.
-    virtual void mainFrameViewCreated(WebFrameImpl*) = 0;
-
-    // Returns true if the device metrics override mode is enabled.
-    virtual bool metricsOverridden() = 0;
-
     // WebViewImpl has been resized.
     virtual void webViewResized(const WebSize&) = 0;
 
     // DevTools may handle input event from WebViewImpl.
     virtual bool handleInputEvent(WebCore::Page*, const WebInputEvent&) = 0;
 };
 
 } // namespace WebKit
 
 #endif