Get rid of all the library tags.

test/transformer/exclusion/works_on_dart2js_test.dart

Index: test/transformer/exclusion/works_on_dart2js_test.dart
diff --git a/test/transformer/exclusion/works_on_dart2js_test.dart b/test/transformer/exclusion/works_on_dart2js_test.dart
index c96d234759b2ec901201b7d5e492617792f66e94..2c63d8a7e35bae6635784dbdd48e8a7138d736b3 100644
--- a/test/transformer/exclusion/works_on_dart2js_test.dart
+++ b/test/transformer/exclusion/works_on_dart2js_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:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';