mash: Move chromeos audio system tray files to //ash/common

ash/system/chromeos/audio/tray_audio_chromeos.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_CHROMEOS_AUDIO_TRAY_AUDIO_CHROMEOS_H_
-#define ASH_SYSTEM_CHROMEOS_AUDIO_TRAY_AUDIO_CHROMEOS_H_
-
-#include <stdint.h>
-
-#include "ash/ash_export.h"
-#include "ash/common/system/audio/tray_audio.h"
-#include "base/macros.h"
-#include "chromeos/dbus/power_manager_client.h"
-
-namespace ash {
-namespace tray {
-class AudioDetailedView;
-}
-
-class ASH_EXPORT TrayAudioChromeOs
-    : public TrayAudio,
-      public chromeos::PowerManagerClient::Observer {
- public:
-  explicit TrayAudioChromeOs(SystemTray* system_tray);
-  ~TrayAudioChromeOs() override;
-
- protected:
-  // Overridden from TrayAudio
-  void Update() override;
-
- private:
-  // Overridden from SystemTrayItem.
-  views::View* CreateDetailedView(LoginStatus status) override;
-  void DestroyDetailedView() override;
-
-  // Overridden from display::DisplayObserver.
-  void OnDisplayAdded(const display::Display& new_display) override;
-  void OnDisplayRemoved(const display::Display& old_display) override;
-  void OnDisplayMetricsChanged(const display::Display& display,
-                               uint32_t changed_metrics) override;
-
-  // Overriden from chromeos::PowerManagerClient::Observer.
-  void SuspendDone(const base::TimeDelta& sleep_duration) override;
-
-  tray::AudioDetailedView* audio_detail_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayAudioChromeOs);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CHROMEOS_AUDIO_TRAY_AUDIO_CHROMEOS_H_