URLEnumerator* result = new URLEnumerator(kToken_URLColumn, kToken_HiddenColumn);
URLEnumerator* result = new URLEnumerator(kToken_URLColumn);
nsGlobalHistory::GetAllResources(nsISimpleEnumerator** aResult){  URLEnumerator* result = new URLEnumerator(kToken_URLColumn,                                            kToken_HiddenColumn);  if (! result)    return NS_ERROR_OUT_OF_MEMORY;  nsresult rv;  rv = result->Init(mEnv, mTable);  if (NS_FAILED(rv)) return rv;  *aResult = result;  NS_ADDREF(*aResult);  return NS_OK;}