This reverts commit 3c814957.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> depot_tools: Run Python scripts using vpython (Part 2)
> 
> Tbr: iannucci@chromium.org
> Bug: 984182
> Change-Id: I2e8469f8ee0acd6a54109697d5a6b76faf24fa42
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1748590
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

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

Change-Id: Ic683543a04b45f733b48d6c43453fc8dff511d09
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 984182
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1749852Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>