Remove direct references to hermetic mac toolchain.

tools/clang/scripts/update.py

 #!/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.
 
 """This script is used to download prebuilt clang binaries.
 
 It is also used by package.py to build the prebuilt clang binaries."""
 
 import argparse
@@ skipping 149 matching lines @@
 def WriteStampFile(s, path=STAMP_FILE):
   """Write s to the stamp file."""
   EnsureDirExists(os.path.dirname(path))
   with open(path, 'w') as f:
     f.write(s)
     f.write('\n')
 
 
 def GetSvnRevision(svn_repo):
   """Returns current revision of the svn repo at svn_repo."""
-  if sys.platform == 'darwin':
-    # mac_files toolchain must be set for hermetic builds.
-    root = os.path.dirname(os.path.dirname(os.path.dirname(
-        os.path.dirname(__file__))))
-    sys.path.append(os.path.join(root, 'build'))
-    import mac_toolchain
-
-    mac_toolchain.SetToolchainEnvironment()

[justincohen, 2016/10/13 18:09:09]

Does this file not need --developer_dir anymore?

[erikchen, 2016/10/13 19:43:54]

As I indicate in the commit message:
"""
svn is assumed to be installed on the system. It is not pulled from the hermetic
toolchain.
"""

   svn_info = subprocess.check_output('svn info ' + svn_repo, shell=True)
   m = re.search(r'Revision: (\d+)', svn_info)
   return m.group(1)
 
 
 def RmTree(dir):
   """Delete dir."""
   def ChmodAndRetry(func, path, _):
     # Subversion can leave read-only files around.
     if not os.access(path, os.W_OK):
@@ skipping 712 matching lines @@
     args.force_local_build = True
     if 'OS=android' not in os.environ.get('GYP_DEFINES', ''):
       # Only build the Android ASan rt on ToT bots when targetting Android.
       args.with_android = False
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())