return it->QueryInterface(kISizeOfHandlerIID, (void **) aInstancePtrResult);
return it->QueryInterface(NS_GET_IID(nsISizeOfHandler), (void **) aInstancePtrResult);
NS_NewSizeOfHandler(nsISizeOfHandler** aInstancePtrResult){  nsISizeOfHandler *it = new nsSizeOfHandler();  if (it == nsnull) {    return NS_ERROR_OUT_OF_MEMORY;  }  return it->QueryInterface(kISizeOfHandlerIID, (void **) aInstancePtrResult);}