Use Python version bundled with depot_tools for all scripts

depot_tools ships a "vpython" binary that is added to the $PATH
for all Chromium engineers. This binary is versioned by depot_tools
which we roll in ourselves as part of `gclient sync`.

By using `vpython` instead of `python`, we are no longer depended
on the Python version installed locally and instead use the version
we pull in from DEPS.

[email protected]

Change-Id: If49a54c24b6cf129ff843cd9ca1140a723a78afb
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2571462
Reviewed-by: Liviu Rau <[email protected]>
Commit-Queue: Tim van der Lippe <[email protected]>
diff --git a/scripts/deps/download_chromium.py b/scripts/deps/download_chromium.py
index 983bca6..ae1c519 100755
--- a/scripts/deps/download_chromium.py
+++ b/scripts/deps/download_chromium.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython
 #
 # Copyright 2019 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be