Revert "Extend the mDNS package with a native extension used on Mac OS"

pkg/mdns/lib/src/lookup_resolver.dart

-// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
+// Copyright (c) 2015, the Dart 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.md file.
+// BSD-style license that can be found in the LICENSE file.
 
 library mdns.src.lookup_resolver;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:mdns/src/packet.dart';
 
 class PendingRequest extends LinkedListEntry {
   final String hostname;
@@ skipping 13 matching lines @@
     var request = new PendingRequest(hostname, completer);
     pendingRequests.add(request);
     return completer.future.timeout(timeout, onTimeout: () {
       request.unlink();
       return null;
     });
   }
 
   void handleResponse(List<DecodeResult> response) {
     for (var r in response) {
-      var name = r.name.toLowerCase();
-      if (name.endsWith('.')) name = name.substring(0, name.length - 1);
       pendingRequests
-          .where((pendingRequest) {
-            return pendingRequest.hostname.toLowerCase() == name;
-          })
+          .where((pendingRequest) => pendingRequest.hostname == r.name)
           .forEach((pendingRequest) {
                 pendingRequest.completer.complete(r.address);
                 pendingRequest.unlink();
-          });
-    }
+              });
+          }
   }
 }
+