private Callback<Void> securityProcessResponseCallback() {
      return buildCallback(metrics.undeleteBlobSecurityProcessResponseMetrics,
          securityCheckResult -> finalCallback.onCompletion(null, null), restRequest.getUri(), LOGGER, finalCallback);
    }
After {@link SecurityService#processResponse}, call {@code finalCallback}.
@return a {@link Callback} to be used with {@link SecurityService#processResponse}.
ambry-frontend/src/main/java/com/github/ambry/frontend/UndeleteHandler.java