Get rid of all the library tags.

test/hosted/fail_gracefully_on_missing_package_test.dart

Index: test/hosted/fail_gracefully_on_missing_package_test.dart
diff --git a/test/hosted/fail_gracefully_on_missing_package_test.dart b/test/hosted/fail_gracefully_on_missing_package_test.dart
index 47ed115b7e516b0dc03e78d9e337bf8a863a8739..ca32cb6bb03ee31c83d95c7451745df410ab478a 100644
--- a/test/hosted/fail_gracefully_on_missing_package_test.dart
+++ b/test/hosted/fail_gracefully_on_missing_package_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;