Get rid of all the library tags.

test/serve/web_socket/unserve_directory_arg_errors_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:json_rpc_2/error_code.dart' as rpc_error_code;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../utils.dart';
 
 main() {
   setUp(() {
     d.dir(appPath, [
@@ skipping 24 matching lines @@
 
   integration("responds with an error if 'path' reaches out", () {
     pubServe();
     expectWebSocketError("unserveDirectory", {"path": "a/../../bad.txt"},
         rpc_error_code.INVALID_PARAMS,
         '"path" cannot reach out of its containing directory. Got '
             '"a/../../bad.txt".');
     endPubServe();
   });
 }