gNameSpaceManager->GetElementFactory(aNameSpaceID, aResult);
nsContentUtils::GetNSManagerWeakRef()->GetElementFactory(aNameSpaceID, aResult);
nsXULContentBuilder::GetElementFactory(PRInt32 aNameSpaceID, nsIElementFactory** aResult){    gNameSpaceManager->GetElementFactory(aNameSpaceID, aResult);    if (!*aResult) {        *aResult = gXMLElementFactory; // Nothing found. Use generic XML element.        NS_IF_ADDREF(*aResult);    }}