Fixes the ability to AU after running chromeos-install

Make it possible to run chromeos-install without root

BUG=none
TEST=Build image, chromeos-install, verify ROOT-B is full size

Change-Id: Id506f1e5a6f8b8ee03ea1bdd621aaab1239bca2c
Reviewed-on: https://gerrit.chromium.org/gerrit/34081
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Ready: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34135
3 files changed