android: Remove unused --stamp option from dex.py.

build/android/gyp/dex.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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 optparse
 import os
 import sys
 
@@ skipping 26 matching lines @@
   parser.add_option('--dex-path', help='Dex output path.')
   parser.add_option('--configuration-name',
                     help='The build CONFIGURATION_NAME.')
   parser.add_option('--proguard-enabled',
                     help='"true" if proguard is enabled.')
   parser.add_option('--proguard-enabled-input-path',
                     help=('Path to dex in Release mode when proguard '
                           'is enabled.'))
   parser.add_option('--no-locals',
                     help='Exclude locals list from the dex file.')
-  parser.add_option('--stamp', help='Path to touch on success.')
 
   # TODO(newt): remove this once http://crbug.com/177552 is fixed in ninja.
   parser.add_option('--ignore', help='Ignored.')
 
   options, paths = parser.parse_args()
 
   if (options.proguard_enabled == 'true'
       and options.configuration_name == 'Release'):
     paths = [options.proguard_enabled_input_path]
 
   DoDex(options, paths)
 
-  if options.stamp:
-    build_utils.Touch(options.stamp)
-
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))