ash: Cleanup class/struct forward declarations

ash/common/system/chromeos/ime_menu/ime_menu_tray.h

 // Copyright 2016 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 ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h"
 #include "ash/common/system/ime/ime_observer.h"
 #include "ash/common/system/tray/ime_info.h"
 #include "ash/common/system/tray/tray_background_view.h"
 #include "ash/common/system/tray/tray_bubble_wrapper.h"
 #include "base/macros.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 
 namespace views {
 class Label;
 }  // namespace views
 
 namespace ash {
 class ImeListView;
-class StatusAreaWidget;
-class WmWindow;
 
 // The tray item for IME menu, which shows the detailed view of a null single
 // item.
 class ASH_EXPORT ImeMenuTray : public TrayBackgroundView,
                                public IMEObserver,
                                public views::TrayBubbleView::Delegate,
                                public keyboard::KeyboardControllerObserver,
                                public VirtualKeyboardObserver {
  public:
   explicit ImeMenuTray(WmShelf* wm_shelf);
@@ skipping 71 matching lines @@
   bool force_show_keyboard_;
   bool should_block_shelf_auto_hide_;
   bool keyboard_suppressed_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeMenuTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_IME_MENU_IME_MENU_TRAY_H_