The calls to use were removed in CL 36715.

Change-Id: I9f664d57e2595e932d702fdf6318d377e93e428a
Reviewed-on: https://go-review.googlesource.com/117455
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>