Missing NS_OK from roc's checkin, in nsGlobalWindow::FireDelayedDOMEvents.

dom/src/base/nsGlobalWindow.cpp

@@ -5482,6 +5482,8 @@ nsGlobalWindow::FireDelayedDOMEvents()
     mFireOfflineStatusChangeEventOnThaw = PR_FALSE;
     FireOfflineStatusEvent();
   }
+
+  return NS_OK;
 }
 
 //*****************************************************************************