nsIContent* aElement)
nsIContent* aElement, nsICSSLoaderObserver* aObserver)
CSSLoaderImpl::AddPendingSheet(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,                               nsIContent* aElement) {  PendingSheetData* data = new PendingSheetData(aSheet, aDocIndex, aElement);  if (data) {    mPendingDocSheets.AppendElement(data);    return NS_OK;  }  return NS_ERROR_OUT_OF_MEMORY;}