Cleanup: Remove unneeded forward declarations from chrome/browser/ui/webui.

chrome/browser/ui/webui/options/options_ui.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_UI_WEBUI_OPTIONS_OPTIONS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_
 #pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/chrome_web_ui.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_types.h"
 
-class GURL;
-class PrefService;
-struct UserMetricsAction;
-
 // The base class handler of Javascript messages of options pages.
 class OptionsPageUIHandler : public WebUIMessageHandler,
                              public content::NotificationObserver {
  public:
   OptionsPageUIHandler();
   virtual ~OptionsPageUIHandler();
 
   // Is this handler enabled?
   virtual bool IsEnabled();
 
@@ skipping 70 matching lines @@
   // Sets the WebUI CommandLineString property with arguments passed while
   // launching chrome.
   void SetCommandLineString(RenderViewHost* render_view_host);
 
   bool initialized_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(OptionsUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_