Left over from CL 39855.

Change-Id: I9df8b5c631d5afbdbf2fb306876648d8541931d3
Reviewed-on: https://go-review.googlesource.com/40941
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>