Modernize the package's style.

lib/src/delegate/stream_consumer.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.delegate.stream_consumer;
-
 import 'dart:async';
 
 /// Simple delegating wrapper around a [StreamConsumer].
 ///
 /// Subclasses can override individual methods, or use this to expose only the
 /// [StreamConsumer] methods of a subclass.
 class DelegatingStreamConsumer<T> implements StreamConsumer<T> {
   final StreamConsumer _consumer;
 
   /// Create a delegating consumer forwarding calls to [consumer].
   DelegatingStreamConsumer(StreamConsumer consumer)
       : _consumer = consumer;
 
   Future addStream(Stream<T> stream) => _consumer.addStream(stream);
 
   Future close() => _consumer.close();
 }