Cleanup: Remove unneeded forward declarations in views.

views/controls/menu/menu_item_view.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 VIEWS_CONTROLS_MENU_MENU_ITEM_VIEW_H_
 #define VIEWS_CONTROLS_MENU_MENU_ITEM_VIEW_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
 #include "base/logging.h"
 #include "base/string16.h"
+#include "build/build_config.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "views/view.h"
 
 #if defined(OS_WIN)
+#include <windows.h>
+
 #include "ui/gfx/native_theme.h"
 #endif
 
 namespace gfx {
 class Font;
 }
 
 namespace ui {
 class MenuModel;
 }
 
 namespace views {
 
 namespace internal {
 class MenuRunnerImpl;
 }
 
-class MenuButton;
 struct MenuConfig;
 class MenuController;
 class MenuDelegate;
 class SubmenuView;
 
 // MenuItemView --------------------------------------------------------------
 
 // MenuItemView represents a single menu item with a label and optional icon.
 // Each MenuItemView may also contain a submenu, which in turn may contain
 // any number of child MenuItemViews.
@@ skipping 415 matching lines @@
   // position of the menu being shown.
   MenuPosition requested_menu_position_;
   MenuPosition actual_menu_position_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuItemView);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_MENU_MENU_ITEM_VIEW_H_