Convert //ash from scoped_ptr to std::unique_ptr

ash/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_
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "ash/system/audio/audio_observer.h"
 #include "ash/system/tray/tray_image_item.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/display_observer.h"
 
 namespace ash {
 
 namespace system {
 class TrayAudioDelegate;
 }
 
 namespace tray {
 class VolumeView;
 }
 
 class TrayAudio : public TrayImageItem,
                   public AudioObserver,
                   public gfx::DisplayObserver {
  public:
   TrayAudio(SystemTray* system_tray,
-            scoped_ptr<system::TrayAudioDelegate> audio_delegate);
+            std::unique_ptr<system::TrayAudioDelegate> audio_delegate);
   ~TrayAudio() override;
 
   static bool ShowAudioDeviceMenu();
 
  protected:
   // Overridden from gfx::DisplayObserver.
   void OnDisplayAdded(const gfx::Display& new_display) override;
   void OnDisplayRemoved(const gfx::Display& old_display) override;
   void OnDisplayMetricsChanged(const gfx::Display& display,
                                uint32_t changed_metrics) override;
 
   virtual void Update();
 
-  scoped_ptr<system::TrayAudioDelegate> audio_delegate_;
+  std::unique_ptr<system::TrayAudioDelegate> audio_delegate_;
   tray::VolumeView* volume_view_;
 
   // True if VolumeView should be created for accelerator pop up;
   // Otherwise, it should be created for detailed view in ash tray bubble.
   bool pop_up_volume_view_;
 
  private:
   // Overridden from TrayImageItem.
   bool GetInitialVisibility() override;
 
@@ skipping 13 matching lines @@
   void OnActiveInputNodeChanged() override;
 
   void ChangeInternalSpeakerChannelMode();
 
   DISALLOW_COPY_AND_ASSIGN(TrayAudio);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_AUDIO_TRAY_AUDIO_H_