Convert //ash from scoped_ptr to std::unique_ptr

ash/system/chromeos/supervised/tray_supervised_user.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/supervised/tray_supervised_user.h"
 
 #include <utility>
 
 #include "ash/shell.h"
 #include "ash/system/chromeos/label_tray_view.h"
@@ skipping 78 matching lines @@
       !delegate->GetSupervisedUserManager().empty())
     CreateOrUpdateSupervisedWarningNotification();
 
   status_ = status;
   is_user_supervised_ = is_user_supervised;
 }
 
 void TraySupervisedUser::CreateOrUpdateNotification(
     const base::string16& new_message) {
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
-  scoped_ptr<Notification> notification(
+  std::unique_ptr<Notification> notification(
       message_center::Notification::CreateSystemNotification(
           kNotificationId, base::string16() /* no title */, new_message,
           bundle.GetImageNamed(GetSupervisedUserIconId()),
           system_notifier::kNotifierSupervisedUser,
           base::Closure() /* null callback */));
   message_center::MessageCenter::Get()->AddNotification(
       std::move(notification));
 }
 
 void TraySupervisedUser::CreateOrUpdateSupervisedWarningNotification() {
@@ skipping 19 matching lines @@
 
   // Not intended to be used for non-supervised users.
   CHECK(delegate->IsUserSupervised());
 
   if (delegate->IsUserChild())
     return IDR_AURA_UBER_TRAY_CHILD_USER;
   return IDR_AURA_UBER_TRAY_SUPERVISED_USER;
 }
 
 }  // namespace ash