nsIContent* aParentContent, nsIAtom* aPseudoTag,
nsIContent* aContent,
HTMLStyleSheetImpl::RulesMatching(nsIPresContext* aPresContext,                                  nsIAtom* aMedium,                                  nsIContent* aParentContent,                                  nsIAtom* aPseudoTag,                                  nsIStyleContext* aParentContext,                                  nsISupportsArray* aResults){  // no pseudo frame style  return NS_OK;}