Get rid of all the library tags.

lib/src/barback/source_directory.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 pub.barback.source_directory;
-
 import 'dart:async';
 
 import 'package:watcher/watcher.dart';
 
 import 'asset_environment.dart';
 import 'barback_server.dart';
 
 /// A directory in the entrypoint package whose contents have been made
 /// available to barback and that are bound to a server.
 class SourceDirectory {
@@ skipping 42 matching lines @@
       // Stop watching the directory.
       if (watchSubscription != null) {
         var cancel = watchSubscription.cancel();
         if (cancel != null) futures.add(cancel);
       }
 
       return Future.wait(futures);
     });
   }
 }