Remove unused --save-downloads-dir option from download_toolchains.py

build/download_toolchains.py

 #!/usr/bin/python
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Download all Native Client toolchains for this platform.
 
 This module downloads multiple tgz's and expands them.
 """
 
@@ skipping 298 matching lines @@
       help='Produce less output.')
   parser.add_option(
       '--toolchain-dir', dest='toolchain_dir',
       default=os.path.join(PARENT_DIR, 'toolchain'),
       help='(optional) location of toolchain directory')
   parser.add_option(
       '--nacl-newlib-only', dest='filter_out_predicates',
       action='append_const', const=toolchainbinaries.IsNotNaClNewlibFlavor,
       help='download only the non-pnacl newlib toolchain')
   parser.add_option(
-      '--save-downloads-dir', dest='save_downloads_dir',
-      default=None,
-      help='(optional) preserve the toolchain archives to this dir')
-  parser.add_option(
       '--no-pnacl', dest='filter_out_predicates', action='append_const',
       const=toolchainbinaries.IsPnaclFlavor,
       help='Filter out PNaCl toolchains.')
   parser.add_option(
       '--no-x86', dest='filter_out_predicates', action='append_const',
       const=toolchainbinaries.IsX86Flavor,
       help='Filter out x86 toolchains.')
   parser.add_option(
       '--arm-untrusted', dest='arm_untrusted', action='store_true',
       default=False, help='Add arm untrusted toolchains.')
@@ skipping 80 matching lines @@
       print '-' * 70
       sys.stdout.flush()
       ShowUpdatedDEPS(options, versions)
       print '-' * 70
       return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))