Complete the switch to ServiceObject

runtime/bin/vmservice/server.dart

 // Copyright (c) 2013, 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 file.
 
 part of vmservice_io;
 
 class WebSocketClient extends Client {
   static const int PARSE_ERROR_CODE = 4000;
   static const int BINARY_MESSAGE_ERROR_CODE = 4001;
   static const int NOT_MAP_ERROR_CODE = 4002;
@@ skipping 39 matching lines @@
   dynamic toJson() {
     Map map = super.toJson();
     map['type'] = 'WebSocketClient';
     map['socket'] = '$socket';
     return map;
   }
 }
 
 
 class HttpRequestClient extends Client {
-  static ContentType jsonContentType = ContentType.parse('application/json');
+  static ContentType jsonContentType =
+      new ContentType("application", "json", charset: "utf-8");
   final HttpRequest request;
 
   HttpRequestClient(this.request, service) : super(service);
 
   void post(var seq, String response) {
     request.response..headers.contentType = jsonContentType
                     ..write(response)
                     ..close();
     close();
   }
@@ skipping 53 matching lines @@
       port = s.port;
       _server = s;
       _server.listen(_requestHandler);
       if (display_message) {
         print('VMService listening on port $port');
       }
       return s;
     });
   }
 }