Revert of Delete roll-dep-svn (patchset #1 id:1 of https://codereview.chromium.org/2282223002/ )

Reason for revert:
Still in use. Breaks the v8 auto-rollers.

https://cs.chromium.org/search/?q=roll-dep-svn&sq=package:chromium&type=cs

Original issue's description:
> Delete roll-dep-svn
>
> R=dnj@chromium.org
> BUG=475320
>
> Committed: https://chromium.googlesource.com/chromium/tools/depot_tools/+/96ebc1d0e100021990312072e6eda6b8a0a81ee5

TBR=dnj@chromium.org,agable@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=475320

Review-Url: https://codereview.chromium.org/2297513002

roll-dep-svn

+#!/usr/bin/env bash
+# Copyright (c) 2009 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.
+
+base_dir=$(dirname "$0")
+
+PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/roll_dep_svn.py" "$@"

roll-dep-svn.bat

+@echo off
+:: Copyright (c) 2012 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.
+
+:: This is required with cygwin only.
+PATH=%~dp0;%PATH%
+
+:: Defer control.
+%~dp0python "%~dp0\roll_dep_svn.py" %*