Cleanup native, collected, and stub code handling in profiler

runtime/bin/vmservice/client/lib/src/observatory_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 'package:polymer/polymer.dart';
 import 'observatory_element.dart';
 
 @CustomTag('service-ref')
@@ skipping 20 matching lines @@
     if (ref == null) {
       return '';
     }
     // Return the VM name by default.
     var name = ref['name'];
     return name != null ? name : '';
   }
 
   String get name {
     if (ref == null) {
-      return '';
+      return 'NULL REF';
     }
     String name_key = internal ? 'name' : 'user_name';
     if (ref[name_key] != null) {
       return ref[name_key];
     } else if (ref['name'] != null) {
       return ref['name'];
+    } else if (ref['user_name'] != null) {
+      return ref['user_name'];
     }
     return '';
   }
 
   void isolateChanged(oldValue) {
     notifyPropertyChange(#relativeLink, 0, 1);
   }
 
   @observable
   String relativeLink(String link) {
     if (app == null) {
       return '';
     } else if (isolate == null) {
       return app.locationManager.currentIsolateRelativeLink(link);
     } else {
       return app.locationManager.relativeLink(isolate.id, link);
     }
   }
 }