Updates #19683.

Change-Id: I64b3b93a3ab14518a5376e1270bdd2a94bdd67ef
Reviewed-on: https://go-review.googlesource.com/59611
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>