Remove obviously unneeded forward declarations in chrome/browser/[abef]*/*.h.

chrome/browser/extensions/extension_menu_manager.h

 // Copyright (c) 2010 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_EXTENSIONS_EXTENSION_MENU_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_MENU_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
 #include "chrome/browser/extensions/extension_icon_manager.h"
 #include "chrome/common/extensions/extension_extent.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 struct ContextMenuParams;
 
 class Extension;
-class ExtensionMessageService;
 class Profile;
 class SkBitmap;
 class TabContents;
 
 // Represents a menu item added by an extension.
 class ExtensionMenuItem {
  public:
   // A list of ExtensionMenuItem's.
   typedef std::vector<ExtensionMenuItem*> List;
 
@@ skipping 227 matching lines @@
   std::map<ExtensionMenuItem::Id, ExtensionMenuItem*> items_by_id_;
 
   NotificationRegistrar registrar_;
 
   ExtensionIconManager icon_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionMenuManager);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_MENU_MANAGER_H_