Get rid of all the library tags.

test/serve/web_socket/unserve_directory_arg_errors_test.dart

Index: test/serve/web_socket/unserve_directory_arg_errors_test.dart
diff --git a/test/serve/web_socket/unserve_directory_arg_errors_test.dart b/test/serve/web_socket/unserve_directory_arg_errors_test.dart
index 532a80ed26dcf7f4b5f0037453adbef7e9043430..47f3fde0681c72f8d4d2c69eb3dcbfb5f40ae5a1 100644
--- a/test/serve/web_socket/unserve_directory_arg_errors_test.dart
+++ b/test/serve/web_socket/unserve_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';