ash: Cleanup class/struct forward declarations

ash/common/system/chromeos/tray_caps_lock.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 ASH_COMMON_SYSTEM_CHROMEOS_TRAY_CAPS_LOCK_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_TRAY_CAPS_LOCK_H_
 
 #include "ash/common/system/tray/tray_image_item.h"
 #include "base/macros.h"
 #include "ui/base/ime/chromeos/ime_keyboard.h"
 #include "ui/events/event_handler.h"
 
 namespace views {
-class ImageView;
 class View;
 }
 
 namespace ash {
 class CapsLockDefaultView;
 
 class TrayCapsLock : public TrayImageItem,
                      public chromeos::input_method::ImeKeyboard::Observer {
  public:
   explicit TrayCapsLock(SystemTray* system_tray);
@@ skipping 15 matching lines @@
 
   bool caps_lock_enabled_;
   bool message_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayCapsLock);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_TRAY_CAPS_LOCK_H_