chrome: Cleanup class/struct forward declarations

chrome/browser/ui/app_list/extension_app_item.h

 // Copyright (c) 2012 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_APP_LIST_EXTENSION_APP_ITEM_H_
 #define CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_ITEM_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/ui/app_list/app_context_menu_delegate.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service.h"
 #include "chrome/browser/ui/app_list/chrome_app_list_item.h"
 #include "chrome/browser/ui/extensions/extension_enable_flow_delegate.h"
 #include "extensions/browser/extension_icon_image.h"
 #include "ui/gfx/image/image_skia.h"
 
 class AppListControllerDelegate;
 class ExtensionEnableFlow;
 class Profile;
 
 namespace app_list {
 class ExtensionAppContextMenu;
 }
 
 namespace extensions {
-class ContextMenuMatcher;
 class Extension;
 }
 
 // ExtensionAppItem represents an extension app in app list.
 class ExtensionAppItem : public ChromeAppListItem,
                          public extensions::IconImage::Observer,
                          public ExtensionEnableFlowDelegate,
                          public app_list::AppContextMenuDelegate {
  public:
   static const char kItemType[];
@@ skipping 72 matching lines @@
   // Whether or not this app is a platform app.
   bool is_platform_app_;
 
   // Whether this app item has an overlay.
   bool has_overlay_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppItem);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_ITEM_H_