[CleanUp] Remove parameter |by_user| in NotificationClosed

content/shell/browser/layout_test/layout_test_notification_manager.cc

Index: content/shell/browser/layout_test/layout_test_notification_manager.cc
diff --git a/content/shell/browser/layout_test/layout_test_notification_manager.cc b/content/shell/browser/layout_test/layout_test_notification_manager.cc
index 773e86e4c73b84a6f01b311fb08c7567725e1cb3..9eb7b44e062d429918221f6b4310ad679186ab65 100644
--- a/content/shell/browser/layout_test/layout_test_notification_manager.cc
+++ b/content/shell/browser/layout_test/layout_test_notification_manager.cc
@@ -180,7 +180,7 @@ void LayoutTestNotificationManager::Close(const std::string& title) {
   if (iterator == page_notifications_.end())
     return;
 
-  iterator->second->NotificationClosed(false);
+  iterator->second->NotificationClosed();
 }
 
 void LayoutTestNotificationManager::ReplaceNotificationIfNeeded(
@@ -199,7 +199,7 @@ void LayoutTestNotificationManager::ReplaceNotificationIfNeeded(
       DesktopNotificationDelegate* previous_delegate =
           page_notification_iter->second;
 
-      previous_delegate->NotificationClosed(false);
+      previous_delegate->NotificationClosed();
 
       page_notifications_.erase(page_notification_iter);
       delete previous_delegate;