Get rid of all the library tags.

test/cache/add/package_not_found_test.dart

Index: test/cache/add/package_not_found_test.dart
diff --git a/test/cache/add/package_not_found_test.dart b/test/cache/add/package_not_found_test.dart
index 6949f2a3a31d7575c1745bda7517ba82db9ac7e6..9379ca977939815200f5cd37165d2d62ad3b5533 100644
--- a/test/cache/add/package_not_found_test.dart
+++ b/test/cache/add/package_not_found_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 '../../test_pub.dart';