Modernize the package's style.

lib/src/stream_queue.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_events;
-
 import 'dart:async';
 import 'dart:collection';
 
 import "subscription_stream.dart";
 import "stream_completer.dart";
 import "../result.dart";
 
 /// An asynchronous pull-based interface for accessing stream events.
 ///
 /// Wraps a stream and makes individual events available on request.
@@ skipping 622 matching lines @@
       _completer.complete(true);
       return true;
     }
     if (isDone) {
       _completer.complete(false);
       return true;
     }
     return false;
   }
 }