Fix remoting_webapp build script after r278198.

remoting/webapp/build-webapp.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Creates a directory with with the unpacked contents of the remoting webapp.
 
 The directory will contain a copy-of or a link-to to all remoting webapp
 resources.  This includes HTML/JS and any plugin binaries. The script also
 massages resulting files appropriately with host plugin data. Finally,
@@ skipping 254 matching lines @@
   if len(sys.argv) < 6:
     print ('Usage: build-webapp.py '
            '<build-type> <version> <dst> <zip-path> <manifest_template> '
            '<webapp_type> <other files...> '
            '[--locales <locales...>]')
     return 1
 
   arg_type = ''
   files = []
   locales = []
-  for arg in sys.argv[8:]:
+  for arg in sys.argv[7:]:
     if arg in ['--locales']:
       arg_type = arg
     elif arg_type == '--locales':
       locales.append(arg)
     else:
       files.append(arg)
 
   return buildWebApp(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4],
                      sys.argv[5], sys.argv[6], files, locales)
 
 
 if __name__ == '__main__':
   sys.exit(main())