return it->QueryInterface(NS_GET_IID(nsIContentSerializer), (void**)aSerializer);
return CallQueryInterface(it, aSerializer);
nsresult NS_NewPlainTextSerializer(nsIContentSerializer** aSerializer){  nsPlainTextSerializer* it = new nsPlainTextSerializer();  if (!it) {    return NS_ERROR_OUT_OF_MEMORY;  }  return it->QueryInterface(NS_GET_IID(nsIContentSerializer),                            (void**)aSerializer);}