nsContentList::ContentChanged(nsIDocument* aDocument, nsIContent* aContent, nsISupports* aSubContent) { return NS_OK; }
NS_IMETHOD ContentChanged(nsIDocument *aDocument, nsIContent* aContent, nsISupports* aSubContent) { return NS_OK; }
nsContentList::ContentChanged(nsIDocument* aDocument, nsIContent* aContent,                              nsISupports* aSubContent){  return NS_OK;}