This is mostly for Python 3 improvements.

Bug: gerrit:10418
Change-Id: Ice96b8dc5f700015ae6ec53c0e5b86700bcf6532
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1734587
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>