Get rid of all the library tags.

test/serve/web_socket/serve_directory_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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_tests;
-
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../utils.dart';
 
 main() {
   integration("binds a directory to a new port", () {
     d.dir(appPath, [
       d.appPubspec(),
@@ skipping 27 matching lines @@
         d.file("index.html", "after")
       ])
     ]).create();
 
     waitForBuildSuccess();
     requestShouldSucceed("index.html", "after", root: "test");
 
     endPubServe();
   });
 }