Updates golang/go#28762

Change-Id: If73b292f28e553646431af995942169ce58d43f5
Reviewed-on: https://go-review.googlesource.com/c/149357
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>