return it->QueryInterface(NS_GET_IID(nsIDOMEvent), (void **) aInstancePtrResult);
return CallQueryInterface(it, aInstancePtrResult);
nsresult NS_NewDOMMutationEvent(nsIDOMEvent** aInstancePtrResult,                                nsIPresContext* aPresContext,                                nsEvent *aEvent) {  nsDOMMutationEvent* it = new nsDOMMutationEvent(aPresContext, aEvent);  if (nsnull == it) {    return NS_ERROR_OUT_OF_MEMORY;  }    return it->QueryInterface(NS_GET_IID(nsIDOMEvent), (void **) aInstancePtrResult);}