Generated with eg.

Passes toolstash -cmp.

Change-Id: I3af35191e73a558080f777a4eed93bcec7dfe1f5
Reviewed-on: https://go-review.googlesource.com/21469
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>