nsIStyleSheet* aStyleSheet)
nsIStyleSheet* aStyleSheet, PRBool aDocumentSheet)
nsDOMStyleSheetList::StyleSheetAdded(nsIDocument *aDocument,                                     nsIStyleSheet* aStyleSheet){  if (-1 != mLength) {    nsCOMPtr<nsIDOMStyleSheet> domss(do_QueryInterface(aStyleSheet));    if (domss) {      mLength++;    }  }    return NS_OK;}