Incomplete backout

content/base/src/nsGenericElement.cpp

@@ -2471,7 +2471,7 @@ nsGenericElement::doRemoveChildAt(PRUint32 aIndex, PRBool aNotify,
         NS_EVENT_BITS_MUTATION_NODEREMOVED)) {
     nsMutationEvent mutation(PR_TRUE, NS_MUTATION_NODEREMOVED);
     mutation.mRelatedNode = do_QueryInterface(container);
-    nsEventDispatcher::Dispatch(aKid, nsnull, &mutation, nsnull, nsnull);
+    nsEventDispatcher::Dispatch(aKid, nsnull, &mutation);
   }
 
   // Someone may have removed the kid or any of its siblings while that event