Convert //ash from scoped_ptr to std::unique_ptr

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/system/audio/tray_audio.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "chromeos/dbus/power_manager_client.h"
 
 namespace ash {
 namespace tray {
 class AudioDetailedView;
 }
 
 class ASH_EXPORT TrayAudioChromeOs
     : public TrayAudio,
       public chromeos::PowerManagerClient::Observer {
@@ skipping 20 matching lines @@
   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_