Update VM service to new isolate API

runtime/bin/vmservice/vmservice.dart

Index: runtime/bin/vmservice/vmservice.dart
diff --git a/runtime/bin/vmservice/vmservice.dart b/runtime/bin/vmservice/vmservice.dart
index 681eff1e132901d06afa3e7bdc362b3026325759..c70b3e7027a732e1703d52a7ce97b34f2150fe28 100644
--- a/runtime/bin/vmservice/vmservice.dart
+++ b/runtime/bin/vmservice/vmservice.dart
@@ -19,6 +19,8 @@ part 'service_request_router.dart';
 class VMService {
   static VMService _instance;
   RunningIsolates runningIsolates = new RunningIsolates();
+  ReceivePort _receivePort;

[floitsch, 2013/10/24 15:28:30]

maybe:
final ReceivePort receivePort = new ReceivePort();

but I see why you would want to have the allocation and init (the ".receive")
together.

Maybe then:
final ReceivePort receivePort;

VMService._internal() : _receivePort = new ReceivePort() {
  _receivePort.receive(messageHandler);
}

[Cutch, 2013/10/25 01:21:57]

Done.

+  ReceivePort get receivePort => _receivePort;
 
   void controlMessageHandler(int code, SendPort sp, String name) {
     switch (code) {
@@ -38,7 +40,9 @@ class VMService {
   }
 
   VMService._internal() {
-    port.receive(messageHandler);
+    port.close();

[Ivan Posva, 2013/10/25 00:30:27]

If you do not ever touch the default port, you should not need to close it. What
am I missing?

[Cutch, 2013/10/25 01:21:57]

Removed.

+    _receivePort = new ReceivePort();
+    _receivePort.receive(messageHandler);
   }
 
   factory VMService() {