Use GetRemoteMasterHash() function instead of reinveting the wheel.

slave/skia_slave_scripts/utils/sync_skia_in_chrome.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.
 
 """ Create (if needed) and sync a nested checkout of Skia inside of Chrome. """
 
 from config_private import SKIA_GIT_URL
 from common import chromium_utils
 from optparse import OptionParser
 
 from git_utils import GIT
 import gclient_utils
+import git_utils
 import os
 import re
 import shell_utils
 import shlex
 import sys
 import urllib2
 
 
 CHROME_LKGR_URL = 'http://chromium-status.appspot.com/git-lkgr'
 FETCH = 'fetch.bat' if os.name == 'nt' else 'fetch'
@@ skipping 31 matching lines @@
       DEPS file.
   override_skia_checkout: boolean; whether or not to replace the default Skia
       checkout, which is actually a set of three subdirectory checkouts in
       third_party/skia: src, include, and gyp, with a single checkout of skia at
       the root level. Default is True.
   fetch_target: string; Calls the fetch tool in depot_tools with the specified
       argument. Default is DEFAULT_FETCH_TARGET.
   """
   # Figure out what revision of Skia we should use.
   if not skia_revision:
-    output = shell_utils.run([GIT, 'ls-remote', SKIA_GIT_URL, '--verify',
-                              'refs/heads/master'])
+    output = git_utils.GetRemoteMasterHash(SKIA_GIT_URL)
     if output:
       skia_revision = shlex.split(output)[0]
     if not skia_revision:
       raise Exception('Could not determine current Skia revision!')
   skia_revision = str(skia_revision)
 
   # Use Chrome LKGR, since gclient_utils will force a sync to origin/master.
   if not chrome_revision:
     chrome_revision = urllib2.urlopen(CHROME_LKGR_URL).read()
 
@@ skipping 148 matching lines @@
         chrome_revision=options.chrome_revision,
         fetch_target=options.fetch_target)
     print 'Chrome synced to %s' % actual_chrome_rev
     print 'Skia synced to %s' % actual_skia_rev
   finally:
     os.chdir(cur_dir)
 
 
 if __name__ == '__main__':
   sys.exit(Main())