Changes json_string to typed_string_to_json in perf.c
Changes json_string to typed_string_to_json in perf.c

wez/watchman,nodakai/watchman,facebook/watchman,kwlzn/watchman,kwlzn/watchman,wez/watchman,wez/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,facebook/watchman,kwlzn/watchman,nodakai/watchman,kwlzn/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,wez/watchman,wez/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,wez/watchman,kwlzn/watchman,kwlzn/watchman,facebook/watchman,wez/watchman,wez/watchman,facebook/watchman,facebook/watchman