Update chromeos system menu buttons for MD.

ash/common/system/chromeos/cast/tray_cast.h

 // Copyright 2015 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_CAST_TRAY_CAST_H_
-#define ASH_COMMON_SYSTEM_CAST_TRAY_CAST_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_CAST_TRAY_CAST_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_CAST_TRAY_CAST_H_
 
 #include "ash/common/cast_config_delegate.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "base/macros.h"
 
 namespace ash {
 namespace tray {
 class CastTrayView;
 class CastSelectDefaultView;
@@ skipping 52 matching lines @@
   // Not owned.
   tray::CastTrayView* tray_ = nullptr;
   tray::CastDuplexView* default_ = nullptr;
   tray::CastDetailedView* detailed_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(TrayCast);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CAST_TRAY_CAST_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_CAST_TRAY_CAST_H_