Replace scoped_ptr with std::unique_ptr in //ui

ui/message_center/fake_message_center.h

Index: ui/message_center/fake_message_center.h
diff --git a/ui/message_center/fake_message_center.h b/ui/message_center/fake_message_center.h
index cfbf8e97b3766352b251f0f0409a2f0ccc42d786..023df8e713b81566e7a88c44f6414b621d671177 100644
--- a/ui/message_center/fake_message_center.h
+++ b/ui/message_center/fake_message_center.h
@@ -35,9 +35,10 @@ class FakeMessageCenter : public MessageCenter {
       const std::string& id) override;
   const NotificationList::Notifications& GetVisibleNotifications() override;
   NotificationList::PopupNotifications GetPopupNotifications() override;
-  void AddNotification(scoped_ptr<Notification> notification) override;
-  void UpdateNotification(const std::string& old_id,
-                          scoped_ptr<Notification> new_notification) override;
+  void AddNotification(std::unique_ptr<Notification> notification) override;
+  void UpdateNotification(
+      const std::string& old_id,
+      std::unique_ptr<Notification> new_notification) override;
 
   void RemoveNotification(const std::string& id, bool by_user) override;
   void RemoveAllNotifications(bool by_user, RemoveType type) override;