CL generated mechanically with github.com/mdempsky/unconvert.

Change-Id: I6c555da5972618dca4302ef8be8d93c765f95db3
Reviewed-on: https://go-review.googlesource.com/100035
Run-TryBot: Kunpei Sakai <namusyaka@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>