Get rid of all the library tags.

test/serve/serves_web_and_test_dirs_by_default_test.dart

Index: test/serve/serves_web_and_test_dirs_by_default_test.dart
diff --git a/test/serve/serves_web_and_test_dirs_by_default_test.dart b/test/serve/serves_web_and_test_dirs_by_default_test.dart
index 447fe1beb1f8711d0b6e77184764bc9a6b8b6074..a16baa4cccef48e205863df6643a156439dfe7f7 100644
--- a/test/serve/serves_web_and_test_dirs_by_default_test.dart
+++ b/test/serve/serves_web_and_test_dirs_by_default_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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';