Revert "Switch //build/print_python_deps.py to vpython."

This reverts commit 889f9fb8b864ce17d892e377761483f215baf7b9.

Reason for revert: spec revert for android trybot failures

Original change's description:
> Switch //build/print_python_deps.py to vpython.
> 
> net/tools/testserver/testserver.py (which has a pydeps file) moved to
> vpython last week in
> https://chromium-review.googlesource.com/c/chromium/src/+/874153
> 
> In order to successfully generate a pydeps file for
> it, print_python_deps.py needs to move to vpython as well.
> 
> Bug: 800662
> Change-Id: I09b952f2fc73e4a8bb5e7e652846051eb24ed2ba
> Reviewed-on: https://chromium-review.googlesource.com/878929
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Helen Li <xunjieli@chromium.org>
> Reviewed-by: agrieve <agrieve@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#531236}

TBR=dcheng@chromium.org,xunjieli@chromium.org,agrieve@chromium.org,jbudorick@chromium.org

Change-Id: I060de4e867982af3e5bf085d09cc67e6eb5d1bdb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 800662
Reviewed-on: https://chromium-review.googlesource.com/881705
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#531289}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 537d74db4b393f0a90b09bd9d7dca1ea6321a1c0

print_python_deps.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env vpython
+#!/usr/bin/env python
 # Copyright 2016 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.