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>
diff --git a/roll_dep_svn.py b/roll_dep_svn.py
index a7c9a28..c569969 100755
--- a/roll_dep_svn.py
+++ b/roll_dep_svn.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython
 # Copyright (c) 2014 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.