Replace scoped_ptr with std::unique_ptr in //ui

ui/message_center/popup_timers_controller.cc

Index: ui/message_center/popup_timers_controller.cc
diff --git a/ui/message_center/popup_timers_controller.cc b/ui/message_center/popup_timers_controller.cc
index 14c9065940a5d5736388ca647349f4ae5dd7efc3..2da3e2705e2f242d3a83085c03091c0f81e67639 100644
--- a/ui/message_center/popup_timers_controller.cc
+++ b/ui/message_center/popup_timers_controller.cc
@@ -41,7 +41,7 @@ void PopupTimersController::StartTimer(const std::string& id,
     return;
   }
 
-  scoped_ptr<PopupTimer> timer(new PopupTimer(id, timeout, AsWeakPtr()));
+  std::unique_ptr<PopupTimer> timer(new PopupTimer(id, timeout, AsWeakPtr()));
 
   timer->Start();
   popup_timers_.insert(std::make_pair(id, std::move(timer)));