Remove dependency on PrefChangeRegistrar and renderer_preferences_util from content.

chrome/browser/renderer_host/chrome_render_view_host_observer.h

 // Copyright (c) 2011 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 CHROME_BROWSER_RENDERER_HOST_CHROME_RENDER_VIEW_HOST_OBSERVER_H_
 #define CHROME_BROWSER_RENDERER_HOST_CHROME_RENDER_VIEW_HOST_OBSERVER_H_
 #pragma once
 
 #include "content/browser/renderer_host/render_view_host_observer.h"
 
 // This class holds the Chrome specific parts of RenderViewHost, and has the
 // same lifetime.
 class ChromeRenderViewHostObserver : public RenderViewHostObserver {
  public:
   explicit ChromeRenderViewHostObserver(RenderViewHost* render_view_host);
   virtual ~ChromeRenderViewHostObserver();
 
   // RenderViewHostObserver overrides.
-  virtual bool OnMessageReceived(const IPC::Message& message);
+  virtual void Navigate(const ViewMsg_Navigate_Params& params) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   void OnDomOperationResponse(const std::string& json_string,
                               int automation_id);
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderViewHostObserver);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_CHROME_RENDER_VIEW_HOST_OBSERVER_H_