Use a List rather than a Queue in StreamSplitter.

lib/src/stream_splitter.dart

 // Copyright (c) 2015, 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 async.stream_splitter;
 
 import 'dart:async';
 import 'dart:collection';
 
 import '../result.dart';
@@ skipping 17 matching lines @@
   /// The wrapped stream.
   final Stream<T> _stream;
 
   /// The subscription to [_stream].
   ///
   /// This will be `null` until a branch has a listener.
   StreamSubscription<T> _subscription;
 
   /// The buffer of events or errors that have already been emitted by
   /// [_stream].
-  final _buffer = new Queue<Result<T>>();
+  final _buffer = new List<Result<T>>();
 
   /// The controllers for branches that are listening for future events from
   /// [_stream].
   ///
   /// Once a branch is canceled, it's removed from this list. When [_stream] is
   /// done, all branches are removed.
   final _controllers = new Set<StreamController<T>>();
 
   /// A group of futures returned by [close].
   ///
@@ skipping 155 matching lines @@
   }
 
   /// Marks [_controllers] as done.
   void _onDone() {
     _isDone = true;
     for (var controller in _controllers) {
       _closeGroup.add(controller.close());
     }
   }
 }