mash: Move TrayUpdate to //ash/common

ash/common/system/update/tray_update.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_TRAY_UPDATE_H_
-#define ASH_SYSTEM_TRAY_UPDATE_H_
+#ifndef ASH_COMMON_SYSTEM_UPDATE_TRAY_UPDATE_H_
+#define ASH_COMMON_SYSTEM_UPDATE_TRAY_UPDATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/tray_image_item.h"
 #include "ash/common/system/update/update_observer.h"
 #include "base/macros.h"
 
 namespace views {
 class View;
 }
 
@@ skipping 11 matching lines @@
   views::View* CreateDefaultView(LoginStatus status) override;
 
   // Overridden from UpdateObserver.
   void OnUpdateRecommended(const UpdateInfo& info) override;
 
   DISALLOW_COPY_AND_ASSIGN(TrayUpdate);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_UPDATE_H_
+#endif  // ASH_COMMON_SYSTEM_UPDATE_TRAY_UPDATE_H_