Updates #19320.

Change-Id: Id38df033e3f0873986e668c8ff3855b6e08407a9
Reviewed-on: https://go-review.googlesource.com/69114
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>