Passes toolstash-check.

Change-Id: I01ed1c04be5a23756742d461f13f1e587ea7ecb8
Reviewed-on: https://go-review.googlesource.com/59610
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>