Convert //ash from scoped_ptr to std::unique_ptr

ash/system/chromeos/audio/tray_audio_chromeos.cc

 // 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.
 
 #include "ash/system/chromeos/audio/tray_audio_chromeos.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/system/audio/volume_view.h"
 #include "ash/system/chromeos/audio/audio_detailed_view.h"
 #include "ash/system/chromeos/audio/tray_audio_delegate_chromeos.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "ui/views/view.h"
 
 namespace ash {
 
 using system::TrayAudioDelegate;
 using system::TrayAudioDelegateChromeOs;
 
 TrayAudioChromeOs::TrayAudioChromeOs(SystemTray* system_tray)
-    : TrayAudio(system_tray,
-                scoped_ptr<TrayAudioDelegate>(new TrayAudioDelegateChromeOs())),
+    : TrayAudio(
+          system_tray,
+          std::unique_ptr<TrayAudioDelegate>(new TrayAudioDelegateChromeOs())),
       audio_detail_view_(NULL) {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(
       this);
 }
 
 TrayAudioChromeOs::~TrayAudioChromeOs() {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(
       this);
 }
 
@@ skipping 52 matching lines @@
 }
 
 void TrayAudioChromeOs::SuspendDone(const base::TimeDelta& sleep_duration) {
   // This event is triggered when the device resumes after earlier suspension,
   // we should always start or re-start HDMI re-discovering
   // grace period right after this event.
   audio_delegate_->SetActiveHDMIOutoutRediscoveringIfNecessary(true);
 }
 
 }  // namespace ash