GitLab

Also upload chromedriver symbols to symbol server.

Also add PRESUBMIT for FILES.cfg to prevent syntax errors like I made
last time.

Also fix the overall chromium PRESUBMIT to not try to run a PRESUBMIT_test.py
that doesn't exist. (This was regressed by
https://chromium-review.googlesource.com/c/chromium/src/+/966906
and then partially fixed by
https://chromium-review.googlesource.com/c/chromium/src/+/1015976 )
It was hitting this line:
https://cs.chromium.org/chromium/tools/depot_tools/presubmit_canned_checks.py?q=%22files,+found+none+that+matched%22&sq=package:chromium&dr=C&l=511
"Out of %d files, found none that matched w=%r, b=%r in directory %s"

Bug: 835950
Change-Id: I365204bb87e6f642c12ee03a646b28d28cc4abab
Reviewed-on: https://chromium-review.googlesource.com/1054967Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557995}