nebraska_wrapper.py: Don't use au_nton to make payload type decisions

Newer client requests don't send this value anymore. So we shouldn't
strictly relying on it anymore. There are still older branch clients
sending au_nton. So we still have to process them.

BUG=chromium:1157326
TEST=None

Change-Id: If9e98bce5edac0a87396fca2ebb1b5ce96cb5170
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2585731
Tested-by: Amin Hassani <ahassani@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Sanika Kulkarni <sanikak@chromium.org>
Reviewed-by: David Haddock <dhaddock@chromium.org>
Reviewed-by: Kyle Shimabukuro <kyleshima@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
1 file changed