anchor.diff:  import 'dart:convert';
   import 'dart:io';
   
  +import 'package:_discoveryapis_commons/_discoveryapis_commons.dart'
  +    show DetailedApiRequestError;
   import 'package:gcloud/db.dart';
   import 'package:gcloud/service_scope.dart' as ss;
   import 'package:gcloud/storage.dart';
  
positive.code:     sw.stop();
      _logger.info('$prefix: $count files deleted in ${sw.elapsed}.');
    }
  }
  
negative.code:         final info = await _storage.info(entry.name);
          final age = new DateTime.now().difference(info.updated);
          if (age > _sdkDeleteThreshold) {
            await _deleteFile(entry.name);
          }
        }
      }
  