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:       if (completedList.any((e) => e.uuid == entry.uuid)) {
          // upload was interrupted between setting the final entry and removing
          // the in-progress indicator. Doing the later now.
          await _storage.delete(entry.inProgressObjectName);
        } else {
          final age = new DateTime.now().difference(entry.timestamp).abs();
          if (age > _contentDeleteThreshold) {
            await _deleteAll(entry);
            await _storage.delete(entry.inProgressObjectName);
          }
        }
      }
  
negative.code:       for (var item in page.items) {
          count++;
          final pooledDelete =
              deletePool.withResource(() => _deleteFile(item.name));
          deleteFutures.add(pooledDelete);
        }
        await Future.wait(deleteFutures);
  