Move ash tray audio UI code from ash/system/audio to ash/system/chromeos/audio.

ash/system/chromeos/audio/tray_volume.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_AUDIO_TRAY_VOLUME_H_
-#define ASH_SYSTEM_AUDIO_TRAY_VOLUME_H_
+#ifndef ASH_SYSTEM_CHROMEOS_AUDIO_TRAY_VOLUME_H_
+#define ASH_SYSTEM_CHROMEOS_AUDIO_TRAY_VOLUME_H_
 
-#include "ash/system/audio/audio_observer.h"
+#include "ash/system/chromeos/audio/audio_observer.h"
 #include "ash/system/tray/tray_image_item.h"
 
 namespace ash {
 namespace internal {
 
 namespace tray {
 class VolumeView;
 }
 
 class TrayVolume : public TrayImageItem,
@@ skipping 24 matching lines @@
   // CreateDetailedView()?  Used to avoid resetting |volume_view_|
   // inappropriately in DestroyDefaultView() or DestroyDetailedView().
   bool is_default_view_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayVolume);
 };
 
 }  // namespace internal
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_AUDIO_TRAY_VOLUME_H_
+#endif  // ASH_SYSTEM_CHROMEOS_AUDIO_TRAY_VOLUME_H_