code: @Override
      public void removedService(ServiceReference reference, Object service)
      {
          LOGGER.entering(CLASS_NAME, "removedService", new Object[]{reference, service});
  
          context.ungetService(reference);
  
          ServiceInfo serviceInfo = (ServiceInfo)service;
  
          serviceAgent.deregister(serviceInfo.getServiceURL(), serviceInfo.getLanguage());
  
          LOGGER.exiting(CLASS_NAME, "removedService");
      }
docs: Deregister the instance of {@link ServiceInfo} from the {@link ServiceAgent},
  effectively unregistering the SLP service URL.
  
  @param reference The reference to the OSGi service that implicitly registered the SLP service URL.
  @param service   The instance of {@link ServiceInfo} to deregister.
  @see org.osgi.util.tracker.ServiceTracker#removedService(ServiceReference, Object)
  @see org.livetribe.slp.sa.ServiceAgent#deregister(org.livetribe.slp.ServiceURL, String)