Get rid of all the library tags.

test/serve/web_socket/serve_directory_arg_errors_test.dart

Index: test/serve/web_socket/serve_directory_arg_errors_test.dart
diff --git a/test/serve/web_socket/serve_directory_arg_errors_test.dart b/test/serve/web_socket/serve_directory_arg_errors_test.dart
index 2f788f9638025a77fdb498a4fd478e4a73729d74..83c10491f8d82cd841237187c4ebdbe9ded48755 100644
--- a/test/serve/web_socket/serve_directory_arg_errors_test.dart
+++ b/test/serve/web_socket/serve_directory_arg_errors_test.dart
@@ -2,8 +2,6 @@
 // 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';