Remove Skia's forked buildbot code

slave/skia_slave_scripts/flavor_utils/xsan_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 ASAN,TSAN,etc. build steps. """
-
-from default_build_step_utils import DefaultBuildStepUtils
-from py.utils import shell_utils
-
-import os
-
-class XsanBuildStepUtils(DefaultBuildStepUtils):
-  def Compile(self, target):
-    # Run the xsan_build script.
-    os.environ['GYP_DEFINES'] = self._step.args['gyp_defines']
-    print 'GYP_DEFINES="%s"' % os.environ['GYP_DEFINES']
-    cmd = [
-        os.path.join('tools', 'xsan_build'),
-        self._step.args['sanitizer'],
-        target,
-        'BUILDTYPE=%s' % self._step.configuration,
-    ]
-
-    cmd.extend(self._step.default_make_flags)
-    cmd.extend(self._step.make_flags)
-    shell_utils.run(cmd)
-
-  def RunFlavoredCmd(self, app, args):
-    os.environ['ASAN_SYMBOLIZER_PATH'] = '/usr/bin/llvm-symbolizer-3.5'
-    os.environ['ASAN_OPTIONS'] = 'symbolize=1 detect_leaks=1'
-    os.environ['LSAN_OPTIONS'] = \
-            'symbolize=1 suppressions=tools/lsan.supp print_suppressions=1'
-    os.environ['TSAN_OPTIONS'] = 'suppressions=tools/tsan.supp'
-    return shell_utils.run([self._PathToBinary(app)] + args)