Get rid of all the library tags.

test/hosted/offline_test.dart

Index: test/hosted/offline_test.dart
diff --git a/test/hosted/offline_test.dart b/test/hosted/offline_test.dart
index 36176fa8a6422b929a7b7f9f3f92cf8cc1ca8669..1384517e1ebaf63763e1bac1718f3ad7a58535f5 100644
--- a/test/hosted/offline_test.dart
+++ b/test/hosted/offline_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:pub/src/exit_codes.dart' as exit_codes;
 
 import '../descriptor.dart' as d;