Fix build error in request_logger. Change: 141609172
Fix build error in request_logger.
Change: 141609172

avloss/serving,addappio/serving,avloss/serving,penguin138/serving,kchodorow/serving,sreddybr3/serving,sreddybr3/serving,avloss/serving,sreddybr3/serving,addappio/serving,sreddybr3/serving,tensorflow/serving,tensorflow/serving,kchodorow/serving,penguin138/serving,addappio/serving,tensorflow/serving,addappio/serving,penguin138/serving,kchodorow/serving,avloss/serving,penguin138/serving,tensorflow/serving