Get rid of all the library tags.

test/transformer/exclusion/works_on_transformer_group_test.dart

Index: test/transformer/exclusion/works_on_transformer_group_test.dart
diff --git a/test/transformer/exclusion/works_on_transformer_group_test.dart b/test/transformer/exclusion/works_on_transformer_group_test.dart
index 9b724636c1f4e14041fbdd14ab6c776f5c08ce8c..cbc31df108fbaa689e020b4455b47663b958b6a0 100644
--- a/test/transformer/exclusion/works_on_transformer_group_test.dart
+++ b/test/transformer/exclusion/works_on_transformer_group_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 '../../serve/utils.dart';