The generator recently changed the default ObjC prefix to the empty string but the benchmark wasn't changed accordingly (the benchmark doesn't run in -short mode). Fixes golang/go#19048 Change-Id: Id8f63da787f399410ea86c13ee77eb3005d31f38 Reviewed-on: https://go-review.googlesource.com/37314 Reviewed-by: Andris Valums <eighttt@fastmail.com> Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>