Roll to pickup pool changes

packages/barback/test/transformer/declaring_aggregate_many_to_many.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library barback.test.transformer.declaring_aggregate_many_to_many;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 
 import 'aggregate_many_to_many.dart';
 
 /// Like [AggregateManyToManyTransformer], but declares its assets ahead of
 /// time.
 class DeclaringAggregateManyToManyTransformer
     extends AggregateManyToManyTransformer
     implements DeclaringAggregateTransformer {
-  DeclaringAggregateManyToManyTransformer(String extension)
-      : super(extension);
+  DeclaringAggregateManyToManyTransformer(String extension) : super(extension);
 
   Future declareOutputs(DeclaringAggregateTransform transform) =>
       transform.primaryIds.asyncMap(transform.declareOutput).toList();
 }