Remove Skia's forked buildbot code

slave/skia_slave_scripts/chrome_drt_canary_run_webkit_tests.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.
-
-""" Run the WebKit tests. """
-
-from build_step import BuildStep, BuildStepWarning
-from py.utils import shell_utils
-import os
-import sys
-
-
-class ChromeDRTCanaryRunWebkitTests(BuildStep):
-  def __init__(self, timeout=16800, no_output_timeout=16800, **kwargs):
-    super(ChromeDRTCanaryRunWebkitTests, self).__init__(
-        timeout=timeout, no_output_timeout=no_output_timeout, **kwargs)
-
-  def _Run(self):
-    test_script_path = os.path.join('webkit', 'tools', 'layout_tests',
-                                    'run_webkit_tests.sh')
-    cmd = [
-        test_script_path, '--build-directory', 'out', '--nocheck-sys-deps',
-        '--additional-platform-directory=%s' %
-            self._flavor_utils.baseline_dir,
-        '--no-show-results'
-    ]
-    if 'new_baseline' in self._args:
-      cmd.append('--new-baseline')
-    if self._configuration == 'Debug':
-      cmd.append('--debug')
-    if 'write_results' in self._args:
-      cmd.append('--results-directory=%s' % self._flavor_utils.result_dir)
-    try:
-      shell_utils.run(cmd)
-    except Exception as e:
-      # Allow this step to fail with a warning, since we expect to see a lot of
-      # failures which aren't our fault. Instead, we care about the diffs.
-      raise BuildStepWarning(e)
-
-
-if '__main__' == __name__:
-  sys.exit(BuildStep.RunBuildStep(ChromeDRTCanaryRunWebkitTests))