Revert "depot_tools: Run Python scripts using vpython (Part 1)"

This reverts commit d6186f993681ad1862236fb895dd4efb2f132bce.

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/+/1749853
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
diff --git a/git_number.py b/git_number.py
index 31d3653..f3d2da7 100755
--- a/git_number.py
+++ b/git_number.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env vpython
+#!/usr/bin/env python
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.