generate_au_zip: Remove unused chromeos-common.sh.

chromeos-common.sh is not used anymore for cros_generate_update_payload.

CQ-DEPEND=CL:284703
BUG=None
TEST=Manual procedure, see below.

Manual procedure:
1. In the chroot:
sudo emerge cros-devutils
./build_library/generate_au_zip.py -o /tmp/`
2. In a new terminal outside the chroot, run sudo and verify it requires
a password (Don't type it).
3. Ran paygen_build_lib._GenerateSinglePayload() with the
au-generator.zip in /tmp and verify it works.

Change-Id: Ic9aa234307dc81127624dd6da90555e60cb57ff3
Reviewed-on: https://chromium-review.googlesource.com/284712
Trybot-Ready: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
1 file changed