Updates #14544.

Change-Id: I24ab8e6f9ad9d290a672216fc2f50f78c3ed8812
Reviewed-on: https://go-review.googlesource.com/21014
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>