Remove Skia's forked buildbot code

slave/skia_slave_scripts/flavor_utils/nacl_build_step_utils.py

-#!/usr/bin/env python
-# Copyright (c) 2013 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.
-
-""" Utilities for NaCl build steps. """
-
-from default_build_step_utils import DefaultBuildStepUtils
-from py.utils import shell_utils
-
-import os
-
-
-ENV_VAR = 'NACL_SDK_ROOT'
-
-
-class NaclBuildStepUtils(DefaultBuildStepUtils):
-  def Compile(self, target):
-    os.environ[ENV_VAR] = self._step.args['nacl_sdk_root']
-    cmd = [os.path.join('platform_tools', 'nacl', 'nacl_make'),
-           target, 'BUILDTYPE=%s' % self._step.configuration,
-           ]
-    cmd.extend(self._step.default_make_flags)
-    if os.name != 'nt':
-      try:
-        ccache = shell_utils.run(['which', 'ccache'], echo=False)
-        if ccache:
-          cmd.append('--use-ccache')
-      except Exception:
-        pass
-    cmd.extend(self._step.make_flags)
-    shell_utils.run(cmd)