This was missed in CL 115236.

Updates #23122

Change-Id: I5a64bd02d356c21c0e5d02dafafb3721f8dd8e06
Reviewed-on: https://go-review.googlesource.com/115276
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>