Get rid of all the library tags.

test/serve/serve_from_dependency_lib_test.dart

Index: test/serve/serve_from_dependency_lib_test.dart
diff --git a/test/serve/serve_from_dependency_lib_test.dart b/test/serve/serve_from_dependency_lib_test.dart
index 400ee954a6a0560951e095ed066e56599893bc1e..c1c47db5e23f2b6cd218f794ea412e48c4cc51c5 100644
--- a/test/serve/serve_from_dependency_lib_test.dart
+++ b/test/serve/serve_from_dependency_lib_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 'utils.dart';