Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/tab_contents/spelling_menu_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_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/timer.h"
 #include "chrome/browser/tab_contents/render_view_context_menu_observer.h"
 #include "content/public/common/url_fetcher_delegate.h"
 
-class GURL;
 class RenderViewContextMenuProxy;
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 // An observer that listens to events from the RenderViewContextMenu class and
 // shows suggestions from the Spelling ("do you mean") service to a context menu
 // while we show it. This class implements two interfaces:
 // * RenderViewContextMenuObserver
@@ skipping 73 matching lines @@
   // The URLFetcher object used for sending a JSON-RPC request.
   scoped_ptr<content::URLFetcher> fetcher_;
 
   // A timer used for loading animation.
   base::RepeatingTimer<SpellingMenuObserver> animation_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellingMenuObserver);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_