Add a working command line debugger to Observatory.

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 112 matching lines @@
       Logger.root.info('Viewing null object.');
       return;
     }
     var type = ref.vmType;
     var element = _constructElementForRef();
     if (element == null) {
       Logger.root.info('Unable to find a ref element for \'${type}\'');
       return;
     }
     children.add(element);
-    Logger.root.info('Viewing object of \'${type}\'');
   }
 }
 
 @CustomTag('object-ref')
 class ObjectRefElement extends ServiceRefElement {
   ObjectRefElement.created() : super.created();
 }