mash: Move SystemTrayImage and TrayImageItem to //ash/common

ash/common/system/tray/system_tray_item.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_SYSTEM_TRAY_ITEM_H_
-#define ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
+#define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
 
 #include "ash/ash_export.h"
+#include "ash/common/login_status.h"
 #include "ash/common/shelf/shelf_types.h"
-#include "ash/system/user/login_status.h"
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 
 namespace views {
 class View;
 }
 
 namespace ash {
 class SystemTray;
 class TrayItemView;
 
@@ skipping 89 matching lines @@
 
  private:
   SystemTray* system_tray_;
   bool restore_focus_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayItem);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_