Mostly done with sed.

Change-Id: Ic8c534a3fdd332b5420d062ee85bb77a30ad1efb
Reviewed-on: https://go-review.googlesource.com/29346
Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>