message: Removed faulty default param
diff: @@ -736,7 +736,7 @@ void LocalFileSystem::RemoveFile(const string &filename) {
  }
  bool LocalFileSystem::ListFiles(const string &directory, const std::function<void(const string &, bool)> &callback,
  - FileOpener *opener = nullptr) {
  + FileOpener *opener) {
  string search_dir = JoinPath(directory, "*");
  auto unicode_path = WindowsUtil::UTF8ToUnicode(search_dir.c_str());
  