nsresult rv = c->QueryInterface(NS_GET_IID(nsICSSFrameConstructor),(void**)aResult);
nsresult rv = CallQueryInterface(c, aResult);
nsresult NS_CreateCSSFrameConstructor(nsICSSFrameConstructor **aResult){  NS_ENSURE_ARG_POINTER(aResult);  *aResult = nsnull;  nsCSSFrameConstructor *c = new nsCSSFrameConstructor();  if (!c)    return NS_ERROR_OUT_OF_MEMORY;  NS_ADDREF(c);  nsresult rv = c->QueryInterface(NS_GET_IID(nsICSSFrameConstructor),(void**)aResult);  NS_RELEASE(c);  return rv;}