Convert //ash from scoped_ptr to std::unique_ptr

ash/system/chromeos/power/tray_power.cc

 // Copyright (c) 2012 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/power/tray_power.h"
 
 #include <utility>
 
 #include "ash/accessibility_delegate.h"
 #include "ash/ash_switches.h"
@@ skipping 203 matching lines @@
 
 bool TrayPower::MaybeShowUsbChargerNotification() {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   const PowerStatus& status = *PowerStatus::Get();
 
   bool usb_charger_is_connected = status.IsUsbChargerConnected();
 
   // Check for a USB charger being connected.
   if (usb_charger_is_connected && !usb_charger_was_connected_ &&
       !usb_notification_dismissed_) {
-    scoped_ptr<Notification> notification(new Notification(
+    std::unique_ptr<Notification> notification(new Notification(
         message_center::NOTIFICATION_TYPE_SIMPLE, kUsbNotificationId,
         rb.GetLocalizedString(IDS_ASH_STATUS_TRAY_LOW_POWER_CHARGER_TITLE),
         ash::SubstituteChromeOSDeviceType(
             IDS_ASH_STATUS_TRAY_LOW_POWER_CHARGER_MESSAGE_SHORT),
         rb.GetImageNamed(IDR_AURA_NOTIFICATION_LOW_POWER_CHARGER),
         base::string16(), GURL(),
         message_center::NotifierId(message_center::NotifierId::SYSTEM_COMPONENT,
                                    system_notifier::kNotifierPower),
         message_center::RichNotificationData(),
         new UsbNotificationDelegate(this)));
@@ skipping 112 matching lines @@
   }
   NOTREACHED();
   return false;
 }
 
 void TrayPower::NotifyUsbNotificationClosedByUser() {
   usb_notification_dismissed_ = true;
 }
 
 }  // namespace ash