NS_IMETHOD ContentStatesChanged(nsIDocument* aDocument, nsIContent* aContent1, nsIContent* aContent2, PRInt32 aStateMask) { return NS_OK; }
NS_IMPL_NSIDOCUMENTOBSERVER_STATE_STUB(nsBindingManager)
  NS_IMETHOD ContentStatesChanged(nsIDocument* aDocument,                                  nsIContent* aContent1,                                  nsIContent* aContent2,                                  PRInt32 aStateMask) { return NS_OK; }