Remove Skia's forked buildbot code

slave/skia_slave_scripts/prebench.py

Index: slave/skia_slave_scripts/prebench.py
diff --git a/slave/skia_slave_scripts/prebench.py b/slave/skia_slave_scripts/prebench.py
deleted file mode 100644
index edce7eb68e44ac64e20e12fed5a7a2f0fa835513..0000000000000000000000000000000000000000
--- a/slave/skia_slave_scripts/prebench.py
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/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.
-
-""" Prepare runtime resources that are needed by Bench builders but not
-    Test builders. """
-
-from build_step import BuildStep
-import sys
-
-
-class PreBench(BuildStep):
-  def _Run(self):
-    if self._perf_data_dir:
-      # Create the data dir if it doesn't exist.
-      self._flavor_utils.CreateCleanDeviceDirectory(self._device_dirs.PerfDir())
-      self._flavor_utils.CreateCleanHostDirectory(self._perf_data_dir)
-
-
-if '__main__' == __name__:
-  sys.exit(BuildStep.RunBuildStep(PreBench))