Fix python scripts in src/chrome/

chrome/tools/webforms_aggregator.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.
 
 """Downloads web pages with fillable forms after parsing through a set of links.
 
 Used for collecting web pages with forms. Used as a standalone script.
 This script assumes that it's run from within the same directory in which it's
 checked into. If this script were to be run elsewhere then the path for
 REGISTER_PAGE_DIR needs to be changed.
@@ skipping 703 matching lines @@
       self.logger.info(
           'URLs that did not return a registration page: %d\n',
           urls_not_found_no)
       return urls_no - urls_not_found_no
     else:
       self.logger.error('Error: no URLs were found.')
       return -1
 
 
 def main():
-  # Command line options.
   usage = 'usage: %prog [options] single_url_or_urls_filename'
   parser = optparse.OptionParser(usage)
   parser.add_option(
       '-l', '--log_level', metavar='LOG_LEVEL', default='error',
       help='LOG_LEVEL: debug, info, warning or error [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)
 
   if len(args) != 1:
     parser.error('Wrong number of arguments.')
 
   logger = logging.getLogger(__name__)
   if options.log_level:
     console = logging.StreamHandler()
     logger.addHandler(console)
     logger.setLevel(options.log_level)
 
   arg_is_a_file = os.path.isfile(args[0])
   if arg_is_a_file:
     CrawlerClass = ThreadedCrawler
   else:
     CrawlerClass = Crawler
   t0 = datetime.datetime.now()
   c = CrawlerClass(args[0], options.log_level)
   c.Run()
   if not arg_is_a_file and c.url_error:
     logger.error(
         'ERROR: "%s" is neither a valid filename nor a valid URL' % args[0])
   t1 = datetime.datetime.now()
   delta_t = t1 - t0
   logger.info('Started at: %s\n', t0)
   logger.info('Ended at: %s\n', t1)
   logger.info('Total execution time: %s\n', delta_t)
+  return 0
 
 
 if __name__ == "__main__":
-  main()
+  sys.exit(main())