Re-land "Extend the mDNS package with a native extension used on Mac OS"

pkg/mdns/test/lookup_resolver_test.dart

Index: pkg/mdns/test/lookup_resolver_test.dart
diff --git a/pkg/mdns/test/lookup_resolver_test.dart b/pkg/mdns/test/lookup_resolver_test.dart
index 2e9b6dbe37dadb7131e9ee9ba428d12ee41c5576..7eb98f06452d4b55883c9224b4d06e3001c882a1 100644
--- a/pkg/mdns/test/lookup_resolver_test.dart
+++ b/pkg/mdns/test/lookup_resolver_test.dart
@@ -1,6 +1,6 @@
-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 // 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.
+// BSD-style license that can be found in the LICENSE.md file.
 
 import 'dart:io';