Remove Skia's forked buildbot code

slave/skia_slave_scripts/utils/download_from_bucket.py

-#!/usr/bin/env python
-# 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.
-
-"""Downloads a single file from a Google Storage Bucket.
-
-To test:
-  cd .../buildbot/slave/skia_slave_scripts/utils
-  CR_BUILDBOT_PATH=../../../third_party/chromium_buildbot
-  PYTHONPATH=$CR_BUILDBOT_PATH/scripts:$CR_BUILDBOT_PATH/site_config \
-  python download_from_bucket.py \
-    --source_gsurl=gs://chromium-skia-gm/DEPS --dest=~/DEPS
-"""
-
-import optparse
-import sys
-
-from slave import slave_utils
-
-
-def DownloadFromBucket(source_gsurl, dest):
-  status = slave_utils.GSUtilDownloadFile(source_gsurl, dest)
-  if status != 0:
-    raise Exception('ERROR: GSUtilDownloadFile error %d. "%s" -> "%s"' % (
-                    status, source_gsurl, dest))
-  return 0
-
-
-def main(argv):
-  option_parser = optparse.OptionParser()
-  option_parser.add_option(
-      '', '--source_gsurl',
-      help='gs://url of the file to download')
-  option_parser.add_option(
-      '', '--dest',
-      help='Destination file/directory where the file will be downloaded.')
-  (options, _args) = option_parser.parse_args()
-  return DownloadFromBucket(source_gsurl=options.source_gsurl,
-                            dest=options.dest)
-
-
-if '__main__' == __name__:
-  sys.exit(main(None))