anchor.diff:      Completer<ServiceActionEvent> completer =
           new Completer<ServiceActionEvent>();
   
  -    ServiceImpl service = getService(event.serviceId);
  +    ServiceImpl service = getServiceImpl(event.serviceId);
       /*%TRACE3*/ print("""(4> 2/13/14): event.serviceId: ${event.serviceId}"""); // TRACE%
       /*%TRACE3*/ print("""(4> 2/13/14): service: ${service}"""); // TRACE%
       service.handleEvent(event).then((ServiceActionEvent responseEvent){
  
positive.code:   Stream<ServiceActionEvent> onResponseMessage;
  
    ChromeService chromeService;
  
    Future<ServiceActionEvent> _onResponseByCallId(String callId) {
      Completer<ServiceActionEvent> completer =
  
negative.code:     onResponseMessage = responseMessageController.stream;
      onHostMessage = hostMessageController.stream;
  
      // Register Service implementations
      _registerServiceImpl(new CompilerServiceImpl(this));
  
      ReceivePort receivePort = new ReceivePort();
      _sendPort.send(receivePort.sendPort);
  