This reverts commit d6186f99.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> depot_tools: Run Python scripts using vpython (Part 1)
> 
> Tbr: iannucci@chromium.org
> Bug: 984182
> Change-Id: If36722e190d305f89d63dce91d0a600ddc34ebe3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1748589
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

TBR=iannucci@chromium.org,ehmaldonado@chromium.org

Change-Id: I7686985852608d0703bcbbab137df1ce82b29723
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 984182
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1749853Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>