2nd attempt at adding streamListen/streamCancel to the service protocol.

runtime/observatory/lib/src/elements/service_ref.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 service_ref_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:polymer/polymer.dart';
 import 'observatory_element.dart';
@@ skipping 103 matching lines @@
     }
   }
 
   refChanged(oldValue) {
     // Remove the current view.
     children.clear();
     if (ref == null) {
       Logger.root.info('Viewing null object.');
       return;
     }
-    var type = ref.vmType;
+    var type = ref.type;
     var element = _constructElementForRef();
     if (element == null) {
       Logger.root.info('Unable to find a ref element for \'${type}\'');
       return;
     }
     children.add(element);
   }
 }
 
 @CustomTag('object-ref')
 class ObjectRefElement extends ServiceRefElement {
   ObjectRefElement.created() : super.created();
 }