Get rid of all the library tags.

test/transformer/exclusion/include_asset_string_test.dart

Index: test/transformer/exclusion/include_asset_string_test.dart
diff --git a/test/transformer/exclusion/include_asset_string_test.dart b/test/transformer/exclusion/include_asset_string_test.dart
index 20a09a5124686a574a6e3750f482134e0c7910da..9eedcc629e042f8d59e509fc3b200c8bdc938e0a 100644
--- a/test/transformer/exclusion/include_asset_string_test.dart
+++ b/test/transformer/exclusion/include_asset_string_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';