anchor.diff:      final http.Response response = await client.put(
         url,
         body: body,
  -      headers: <String, String>{
  -        // TODO(chillers): Remove once b/239021831 has been fixed by the GoB side.
  -        'X-Gerrit-Trace': 'bug-239021831-$branchName'
  -      },
       );
       if (_responseIsAcceptable(response) == false) {
         throw InternalServerError('Gerrit returned ${response.statusCode} which is not 200 or 202');
  
positive.code:   Future<dynamic> _put(
      Uri url, {
      Object? body,
      // TODO(chillers): Remove once b/239021831 has been fixed by the GoB side.
      String? branchName,
    }) async {
      final http.Client authClient = await authClientProvider(baseClient: httpClient, scopes: <String>[]);
      // GoB replicas may not have all the Flutter state, and can require several retries
  
negative.code:     final Map<String, dynamic> response = await _put(
        url,
        body: revision,
      ) as Map<String, dynamic>;
      log.info(response);
      if (response['revision'] != revision) {
  