Add blank line at end of file.

content/xbl/src/nsXBLEventHandler.cpp

@@ -195,4 +195,4 @@ NS_NewXBLKeyEventHandler(nsIAtom* aEventType, PRUint8 aPhase, PRUint8 aType,
   NS_ADDREF(*aResult);
 
   return NS_OK;
-}
+}