mash: Migrate tray IME view to wm common types, move to //ash/common

ash/common/system/ime/ime_observer.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_SYSTEM_IME_IME_OBSERVER_H_
-#define ASH_SYSTEM_IME_IME_OBSERVER_H_
+#ifndef ASH_COMMON_SYSTEM_IME_IME_OBSERVER_H_
+#define ASH_COMMON_SYSTEM_IME_IME_OBSERVER_H_
 
 namespace ash {
 
 class IMEObserver {
  public:
   virtual ~IMEObserver() {}
 
   // Notify the observer that the IME state has changed, and should be
   // refreshed.
   virtual void OnIMERefresh() = 0;
 
   // Notify the observer that the IME menu activation state has changed, and
   // should be refreshed. |is_active| represents whether the new IME menu is
   // active, and IME related items in system tray should be removed if
   // |is_active| is true.
   virtual void OnIMEMenuActivationChanged(bool is_active) = 0;
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_IME_IME_OBSERVER_H_
+#endif  // ASH_COMMON_SYSTEM_IME_IME_OBSERVER_H_