Get rid of all the library tags.

test/snapshot/recompiles_if_the_sdk_is_out_of_date_test.dart

Index: test/snapshot/recompiles_if_the_sdk_is_out_of_date_test.dart
diff --git a/test/snapshot/recompiles_if_the_sdk_is_out_of_date_test.dart b/test/snapshot/recompiles_if_the_sdk_is_out_of_date_test.dart
index 65810151d02bd992606efd68b98747596c2d291f..106f964d85dbed1c1c0fd1dd8008771092539399 100644
--- a/test/snapshot/recompiles_if_the_sdk_is_out_of_date_test.dart
+++ b/test/snapshot/recompiles_if_the_sdk_is_out_of_date_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';
 import 'package:scheduled_test/scheduled_stream.dart';