Update #14759.

Change-Id: I8a174aad721beb62380e10071d9648b6b1c21b8c
Reviewed-on: https://go-review.googlesource.com/22072
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>