nsHashKeys* list = (nsHashKeys*)aClosure; list->AppendKey(aKey);
ret = PL_DHASH_REMOVE;
PRBool PR_CALLBACK FlushSkinSheets(nsHashKey* aKey, void* aData, void* aClosure){  nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)aData;  nsCOMPtr<nsIURI> uri;  sheet->GetURL(*getter_AddRefs(uri));  nsCAutoString str;  uri->GetPath(str);  if (!strncmp(str.get(), "/skin", 5)) {    // This is a skin binding. Add the key to the list.    nsHashKeys* list = (nsHashKeys*)aClosure;    list->AppendKey(aKey);  }  return PR_TRUE;}