Updates golang/go#28535

Change-Id: Id653b21b4d893cc8b6b9a74b129d1ce9b7e26a9f
Reviewed-on: https://go-review.googlesource.com/c/147739Reviewed-by: Mikio Hara <mikioh.public.networking@gmail.com>
Run-TryBot: Mikio Hara <mikioh.public.networking@gmail.com>