Replace scoped_ptr with std::unique_ptr in //ui

ui/arc/notification/arc_notification_item.h

 // Copyright 2016 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 UI_ARC_NOTIFICATION_ARC_NOTIFICATION_ITEM_H_
 #define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_ITEM_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 31 matching lines @@
 
   ArcNotificationManager* const manager_;
   message_center::MessageCenter* const message_center_;
   const AccountId profile_id_;
 
   const std::string notification_key_;
   const std::string notification_id_;
 
   // Stores on-going notification data during the image decoding.
   // This field will be removed after removing async task of image decoding.
-  scoped_ptr<message_center::Notification> notification_;
+  std::unique_ptr<message_center::Notification> notification_;
 
   // The flag to indicate that the removing is initiated by the manager and we
   // don't need to notify a remove event to the manager.
   // This is true only when:
   //   (1) the notification is being removed
   //   (2) the removing is initiated by manager
   bool being_removed_by_manager_ = false;
 
   // Stores the latest notification data which is newer than the on-going data.
   // If the on-going data is either none or the latest, this is null.
   // This field will be removed after removing async task of image decoding.
   ArcNotificationDataPtr newer_data_;
 
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<ArcNotificationItem> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcNotificationItem);
 };
 
 }  // namespace arc
 
 #endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_ITEM_H_