tools: remove `USE_PYTHON3 = True` from PRESUBMIT.py

presubmit now uses python3 only.

This is generated by
$ rg -l '^USE_PYTHON3 = True' | \
  xargs sed -z -i "s/\n*USE_PYTHON3 = True\n*/\n\n\n/"
with some more modifications.

This also removes run_on_python2, run_on_python3, and skip_shebang_check
args.

Bug: 1207012
Change-Id: I43ac77120dc2456bc065a41750f1f5ddfd88d9e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4576841
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1152146}
NOKEYCHECK=True
GitOrigin-RevId: e108f10dfc017ddc158a453b2aa44a5fb7a18674
1 file changed