Replace scoped_ptr with std::unique_ptr in //ui

ui/message_center/notification.cc

Index: ui/message_center/notification.cc
diff --git a/ui/message_center/notification.cc b/ui/message_center/notification.cc
index b0a379ddb9d38b88532f91ef160600c94c8bc126..b2ddd52568c491e65d2f602a4931499b9fc0e17e 100644
--- a/ui/message_center/notification.cc
+++ b/ui/message_center/notification.cc
@@ -169,14 +169,14 @@ bool Notification::UseOriginAsContextMessage() const {
 }
 
 // static
-scoped_ptr<Notification> Notification::CreateSystemNotification(
+std::unique_ptr<Notification> Notification::CreateSystemNotification(
     const std::string& notification_id,
     const base::string16& title,
     const base::string16& message,
     const gfx::Image& icon,
     const std::string& system_component_id,
     const base::Closure& click_callback) {
-  scoped_ptr<Notification> notification(new Notification(
+  std::unique_ptr<Notification> notification(new Notification(
       NOTIFICATION_TYPE_SIMPLE, notification_id, title, message, icon,
       base::string16() /* display_source */, GURL(),
       NotifierId(NotifierId::SYSTEM_COMPONENT, system_component_id),