Get rid of all the library tags.

test/serve/web_socket/serve_directory_overlapping_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:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../utils.dart';
 
 main() {
   integration("fails if the directory overlaps one already being served", () {
     d.dir(appPath, [
@@ skipping 10 matching lines @@
     pubServe();
 
     var webSub = path.join("web", "sub");
     expectWebSocketError("serveDirectory", {"path": webSub}, 2,
         'Path "$webSub" overlaps already served directory "web".',
         data: containsPair("directories", ["web"]));
 
     endPubServe();
   });
 }