Use Clang's update.py --print-revision everywhere.

build/download_gold_plugin.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """Script to download LLVM gold plugin from google storage."""
 
 import json
 import os
 import shutil
 import subprocess
 import sys
 import zipfile
 
 SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
 CHROME_SRC = os.path.abspath(os.path.join(SCRIPT_DIR, os.pardir))
 sys.path.insert(0, os.path.join(CHROME_SRC, 'tools'))
 
 import find_depot_tools
 
 DEPOT_PATH = find_depot_tools.add_depot_tools_to_path()
 GSUTIL_PATH = os.path.join(DEPOT_PATH, 'gsutil.py')
 
 LLVM_BUILD_PATH = os.path.join(CHROME_SRC, 'third_party', 'llvm-build',
                                'Release+Asserts')
-CLANG_UPDATE_SH = os.path.join(CHROME_SRC, 'tools', 'clang', 'scripts',
-                               'update.sh')
-CLANG_REVISION = os.popen(CLANG_UPDATE_SH + ' --print-revision').read().rstrip()
+CLANG_UPDATE_PY = os.path.join(CHROME_SRC, 'tools', 'clang', 'scripts',
+                               'update.py')
+CLANG_REVISION = os.popen(CLANG_UPDATE_PY + ' --print-revision').read().rstrip()
 
 CLANG_BUCKET = 'gs://chromium-browser-clang/Linux_x64'
 
 def main():
   targz_name = 'llvmgold-%s.tgz' % CLANG_REVISION
   remote_path = '%s/%s' % (CLANG_BUCKET, targz_name)
 
   os.chdir(LLVM_BUILD_PATH)
 
   subprocess.check_call(['python', GSUTIL_PATH,
                          'cp', remote_path, targz_name])
   subprocess.check_call(['tar', 'xzf', targz_name])
   os.remove(targz_name)
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())