Get rid of all the library tags.

test/serve/supports_user_defined_declaring_transformers_test.dart

Index: test/serve/supports_user_defined_declaring_transformers_test.dart
diff --git a/test/serve/supports_user_defined_declaring_transformers_test.dart b/test/serve/supports_user_defined_declaring_transformers_test.dart
index eff72f0e355236ae3b1f3f9b8e1e38fc182a9ec3..40630941b35a6a2940af7080e1b4740f5d2d4441 100644
--- a/test/serve/supports_user_defined_declaring_transformers_test.dart
+++ b/test/serve/supports_user_defined_declaring_transformers_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';