Fixes test regression introduced by golang.org/cl/53071.

Change-Id: Ibb085cf6d6be7b91b7c90b7bc6237c10f3097703
Reviewed-on: https://go-review.googlesource.com/60775
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>