Follow-up to CL 38668.

Passes toolstash-check -all.

Change-Id: I78a62509c610b5184b5e7ef2c4aa146fc8038840
Reviewed-on: https://go-review.googlesource.com/38670
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>