Get rid of all the library tags.

test/transformer/prints_a_transform_error_in_apply_test.dart

Index: test/transformer/prints_a_transform_error_in_apply_test.dart
diff --git a/test/transformer/prints_a_transform_error_in_apply_test.dart b/test/transformer/prints_a_transform_error_in_apply_test.dart
index 1e630322f63975ed301f34ebf2d068d366e74b7d..e92d72d426379d05610327641551e3aa2b44a832 100644
--- a/test/transformer/prints_a_transform_error_in_apply_test.dart
+++ b/test/transformer/prints_a_transform_error_in_apply_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';