Get rid of all the library tags.

test/cache/add/no_matching_version_test.dart

Index: test/cache/add/no_matching_version_test.dart
diff --git a/test/cache/add/no_matching_version_test.dart b/test/cache/add/no_matching_version_test.dart
index c343db9ca3a1db281efdd9a2ce645a849359cda0..2f2df5ab50f63bc4baf0c91a6fd31bb8ea36e376 100644
--- a/test/cache/add/no_matching_version_test.dart
+++ b/test/cache/add/no_matching_version_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 '../../test_pub.dart';
 
 main() {