Get rid of all the library tags.

test/snapshot/upgrades_snapshot_for_dependency_test.dart

Index: test/snapshot/upgrades_snapshot_for_dependency_test.dart
diff --git a/test/snapshot/upgrades_snapshot_for_dependency_test.dart b/test/snapshot/upgrades_snapshot_for_dependency_test.dart
index c74d978392ba78c26aa89142cb6979caa65f7543..5ec2d4439b056d1f0a537afaf25e1550b6d46906 100644
--- a/test/snapshot/upgrades_snapshot_for_dependency_test.dart
+++ b/test/snapshot/upgrades_snapshot_for_dependency_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:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_test.dart';