Missed one in the prior CL.

Change-Id: I6f6d84d52fe4d902a985971a402701fb3b1eed86
Reviewed-on: https://go-review.googlesource.com/30255Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>