Cleanup VM service

runtime/bin/vmservice/vmservice.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.
 
 library vmservice;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:isolate';
 import 'dart:typed_data';
@@ skipping 35 matching lines @@
 
   factory VMService() {
     if (VMService._instance == null) {
       VMService._instance = new VMService._internal();
     }
     return _instance;
   }
 }
 
 void sendServiceMessage(SendPort sp, ReceivePort rp, Object m)
-    native "SendServiceMessage";
+    native "VMService_SendServiceMessage";