Revert the refactor (r52005) again, it broke webkit checkout.

gclient_utils.py

 # Copyright 2009 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 292 matching lines @@
   if rv:
     msg = 'failed to run command: %s' % ' '.join(command)
 
     if fail_status != None:
       print >>sys.stderr, msg
       sys.exit(fail_status)
 
     raise Error(msg)
 
 
+def IsUsingGit(root, paths):
+  """Returns True if we're using git to manage any of our checkouts.
+  |entries| is a list of paths to check."""
+  for path in paths:
+    if os.path.exists(os.path.join(root, path, '.git')):
+      return True
+  return False
+
 def FindGclientRoot(from_dir, filename='.gclient'):
   """Tries to find the gclient root."""
   path = os.path.realpath(from_dir)
   while not os.path.exists(os.path.join(path, filename)):
     next = os.path.split(path)
     if not next[1]:
       return None
     path = next[0]
   logging.info('Found gclient root at ' + path)
   return path
@@ skipping 33 matching lines @@
   config_path = FindFileUpwards(config_file, path)
 
   if not config_path:
     print "Can't find %s" % config_file
     return None
 
   env = {}
   execfile(config_path, env)
   config_dir = os.path.dirname(config_path)
   return config_dir, env['entries']