1. DomName('IDBObjectStore.delete')
Future delete(key_OR_keyRange)

Source 

@DomName('IDBObjectStore.delete')
Future delete(key_OR_keyRange){
  try {
    return _completeRequest(_delete(key_OR_keyRange));
  } catch (e, stacktrace) {
    return new Future.error(e, stacktrace);
  }
}