The name chroot_upgrade is rather confusing since we already have
"chroot_update" and those two scripts will be chained. It was the
original name before update_chroot existed.
BUG=none
TEST=run the new one, see it work the same
Change-Id: I851fc4a0f28e32a9bbd01b2e4ddedbaffc6abf1c
Reviewed-on: http://gerrit.chromium.org/gerrit/876
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: Zdenek Behan <zbehan@chromium.org>
