Revert of mac: Roll hermetic toolchain to Xcode 8.3.2.

build/mac_toolchain.py

 #!/usr/bin/env python
 # Copyright 2016 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.
 
 """
 If should_use_hermetic_xcode.py emits "1", and the current toolchain is out of
 date:
   * Downloads the hermetic mac toolchain
     * Requires gsutil to be configured.
   * Accepts the license.
     * If xcode-select and xcodebuild are not passwordless in sudoers, requires
       user interaction.
 """
 
 import os
 import plistlib
 import shutil
 import subprocess
 import sys
 import tarfile
 import time
 import tempfile
 import urllib2
 
 # This can be changed after running /build/package_mac_toolchain.py.
-MAC_TOOLCHAIN_VERSION = '8E2002'
+MAC_TOOLCHAIN_VERSION = '5B1008'
 MAC_TOOLCHAIN_SUB_REVISION = 3
 MAC_TOOLCHAIN_VERSION = '%s-%s' % (MAC_TOOLCHAIN_VERSION,
                                    MAC_TOOLCHAIN_SUB_REVISION)
 IOS_TOOLCHAIN_VERSION = '8C1002'
 IOS_TOOLCHAIN_SUB_REVISION = 1
 IOS_TOOLCHAIN_VERSION = '%s-%s' % (IOS_TOOLCHAIN_VERSION,
                                    IOS_TOOLCHAIN_SUB_REVISION)
 
 # Absolute path to src/ directory.
 REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ skipping 204 matching lines @@
     return_value = DownloadHermeticBuild(
         target_os, default_version, toolchain_filename)
     if return_value:
       return return_value
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())