Fix python scripts in src/tools/

tools/sort-headers.py

-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Given a filename as an argument, sort the #include/#imports in that file.
 
 Shows a diff and prompts for confirmation before doing the deed.
 Works great with tools/git/for-all-touched-files.py.
 """
 
 import optparse
 import os
 import sys
 import termios
 import tty
 
+
 def YesNo(prompt):
   """Prompts with a yes/no question, returns True if yes."""
   print prompt,
   sys.stdout.flush()
   # http://code.activestate.com/recipes/134892/
   fd = sys.stdin.fileno()
   old_settings = termios.tcgetattr(fd)
   ch = 'n'
   try:
     tty.setraw(sys.stdin.fileno())
@@ skipping 75 matching lines @@
 
 def main():
   parser = optparse.OptionParser(usage='%prog filename1 filename2 ...')
   parser.add_option('-f', '--force', action='store_false', default=True,
                     dest='should_confirm',
                     help='Turn off confirmation prompt.')
   opts, filenames = parser.parse_args()
 
   if len(filenames) < 1:
     parser.print_help()
-    sys.exit(1)
+    return 1
 
   for filename in filenames:
     DiffAndConfirm(filename, opts.should_confirm)
 
 
 if __name__ == '__main__':
-  main()
+  sys.exit(main())