Fix bad interpreters.

git_freezer.py

-#!/usr/local/bin/python
+#!/usr/bin/env python
 # Copyright 2014 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.
 
 import sys
 import optparse
 
 import subcommand
 
 from git_common import freeze, thaw
@@ skipping 12 matching lines @@
 
 def main():
   dispatcher = subcommand.CommandDispatcher(__name__)
   ret = dispatcher.execute(optparse.OptionParser(), sys.argv[1:])
   if ret:
     print ret
 
 
 if __name__ == '__main__':
   main()