Cleanup(key, loadData);
loadData->mIsCancelled = PR_TRUE; SheetComplete(loadData, PR_FALSE);
CSSLoaderImpl::StopLoadingSheet(nsIURI* aURL){  NS_ENSURE_TRUE(aURL, NS_ERROR_NULL_POINTER);  if (mLoadingSheets.Count() > 0) {    URLKey key(aURL);    SheetLoadData* loadData = (SheetLoadData*)mLoadingSheets.Get(&key);    if (loadData) {      Cleanup(key, loadData);    }  }  return NS_OK;}