chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/toolbar/app_menu.h

 // Copyright 2013 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_VIEWS_TOOLBAR_APP_MENU_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_APP_MENU_H_
 
 #include <map>
 #include <memory>
 #include <utility>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "base/timer/elapsed_timer.h"
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/views/controls/menu/menu_delegate.h"
 
 class AppMenuObserver;
 class BookmarkMenuDelegate;
 class Browser;
 class ExtensionToolbarMenuView;
 
-namespace ui {
-class NativeTheme;
-}
-
 namespace views {
 class MenuButton;
-struct MenuConfig;
 class MenuItemView;
 class MenuRunner;
-class View;
 }
 
 // AppMenu adapts the AppMenuModel to view's menu related classes.
 class AppMenu : public views::MenuDelegate,
                 public bookmarks::BaseBookmarkModelObserver,
                 public content::NotificationObserver {
  public:
   enum RunFlags {
     // Indicates that the menu was opened for a drag-and-drop operation.
     FOR_DROP = 1 << 0,
@@ skipping 153 matching lines @@
 
   base::ObserverList<AppMenuObserver> observer_list_;
 
   // Records the time from when menu opens to when the user selects a menu item.
   base::ElapsedTimer menu_opened_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(AppMenu);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_APP_MENU_H_