mash: Migrate tray audio and deps to common.

ash/common/system/audio/tray_audio.h

 // Copyright 2014 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_AUDIO_H_
-#define ASH_SYSTEM_AUDIO_TRAY_AUDIO_H_
+#ifndef ASH_COMMON_SYSTEM_AUDIO_TRAY_AUDIO_H_
+#define ASH_COMMON_SYSTEM_AUDIO_TRAY_AUDIO_H_
 
 #include <stdint.h>
 
 #include <memory>
 
+#include "ash/common/system/audio/audio_observer.h"
 #include "ash/common/system/tray/tray_image_item.h"
-#include "ash/system/audio/audio_observer.h"
 #include "base/macros.h"
 #include "ui/display/display_observer.h"
 
 namespace ash {
 
 namespace system {
 class TrayAudioDelegate;
 }
 
 namespace tray {
@@ skipping 45 matching lines @@
   void OnActiveOutputNodeChanged() override;
   void OnActiveInputNodeChanged() override;
 
   void ChangeInternalSpeakerChannelMode();
 
   DISALLOW_COPY_AND_ASSIGN(TrayAudio);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_AUDIO_TRAY_AUDIO_H_
+#endif  // ASH_COMMON_SYSTEM_AUDIO_TRAY_AUDIO_H_