Fix python scripts in src/chrome/

chrome/tools/webforms_extractor.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.
 
 """Extracts registration forms from the corresponding HTML files.
 
 Used for extracting forms within HTML files. This script is used in
 conjunction with the webforms_aggregator.py script, which aggregates web pages
 with fillable forms (i.e registration forms).
 
@@ skipping 209 matching lines @@
               with open(numbered_form_filename, 'w') as f:
                 f.write(form_location_comment)
                 f.write(form_content)
             except IOError as e:
               self.logger.error('Error: %s', e)
               continue
           self.logger.info('\tFile "%s" extracted SUCCESSFULLY!', filename)
 
 
 def main():
-  # Command line options.
   parser = OptionParser()
   parser.add_option(
       '-l', '--log_level', metavar='LOG_LEVEL', default='error',
       help='LOG_LEVEL: debug, info, warning or error [default: %default]')
   parser.add_option(
       '-j', '--js', dest='js', action='store_true', default=False,
       help='Removes all javascript elements [default: %default]')
 
   (options, args) = parser.parse_args()
   options.log_level = options.log_level.upper()
   if options.log_level not in ['DEBUG', 'INFO', 'WARNING', 'ERROR']:
     print 'Wrong log_level argument.'
     parser.print_help()
-    sys.exit(1)
+    return 1
 
   options.log_level = getattr(logging, options.log_level)
   extractor = FormsExtractor(logging_level=options.log_level)
   extractor.Extract(options.js)
+  return 0
 
 
 if __name__ == '__main__':
-  main()
+  sys.exit(main())