NS_IMETHOD Unassert(nsIRDFResource* aSource, nsIRDFResource* aProperty, nsIRDFNode* aTarget) {  return NS_RDF_ASSERTION_REJECTED;
nsGlobalHistory::Unassert(nsIRDFResource* aSource, nsIRDFResource* aProperty, nsIRDFNode* aTarget) {  nsresult rv; if (aSource == kNC_HistoryRoot && aProperty == kNC_child) {  nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(aTarget, &rv);  if (NS_FAILED(rv)) return NS_RDF_ASSERTION_REJECTED;  nsXPIDLCString targetUrl; rv = resource->GetValueConst(getter_Shares(targetUrl)); if (NS_FAILED(rv)) return NS_RDF_ASSERTION_REJECTED;   rv = RemovePage(targetUrl); if (NS_FAILED(rv)) return NS_RDF_ASSERTION_REJECTED;  return NS_OK;
  NS_IMETHOD Unassert(nsIRDFResource* aSource,                      nsIRDFResource* aProperty,                      nsIRDFNode* aTarget) {    // History cannot be modified    return NS_RDF_ASSERTION_REJECTED;  }