PRESUBMIT.cfg: improve PRESUBMIT.py check.

Switch to using presubmit_support.py for the delegation out of
PRESUBMIT.cfg, doesn't rely on the string parsing of the old approach.

BUG=chromium:1039875
TEST=generate

Change-Id: Ib28a6edcad3138e7b2a5821fd063fd6a200e7663
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2107560
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Tested-by: LaMont Jones <lamontjones@chromium.org>
1 file changed