mash: Move StatusTray and StatusAreaWidget to //ash/common

ash/common/system/tray/system_tray.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_H_
-#define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_
+#define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/system_tray_bubble.h"
 #include "ash/common/system/tray/tray_background_view.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 237 matching lines @@
 
   // A reference to the Screen share and capture item.
   ScreenTrayItem* screen_capture_tray_item_;  // not owned
   ScreenTrayItem* screen_share_tray_item_;    // not owned
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_