[NaCl SDK] Convert python scripts from optparse to argparse.

native_client_sdk/src/build_tools/nacl-mono-builder.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.
 
-import optparse
+import argparse
 import os
 import sys
 import tarfile
 
 import buildbot_common
 from build_paths import SCRIPT_DIR
 
 SDK_BUILD_DIR = SCRIPT_DIR
 MONO_BUILD_DIR = os.path.join(SDK_BUILD_DIR, 'mono_build')
 MONO_DIR = os.path.join(MONO_BUILD_DIR, 'nacl-mono')
 
 
 def main(args):
-  parser = optparse.OptionParser()
-  parser.add_option('--arch',
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--arch',
                     help='Target architecture',
                     dest='arch',
                     default='x86-32')
-  parser.add_option('--sdk-revision',
+  parser.add_argument('--sdk-revision',
                     help='SDK Revision'
                          ' (default=buildbot revision)',
                     dest='sdk_revision',
                     default=None)
-  parser.add_option('--sdk-url',
+  parser.add_argument('--sdk-url',
                     help='SDK Download URL',
                     dest='sdk_url',
                     default=None)
-  parser.add_option('--install-dir',
+  parser.add_argument('--install-dir',
                     help='Install Directory',
                     dest='install_dir',
                     default='naclmono')
-  (options, args) = parser.parse_args(args[1:])
+  options = parser.parse_args(args)
 
   assert sys.platform.find('linux') != -1
 
   buildbot_revision = os.environ.get('BUILDBOT_REVISION', '')
 
   build_prefix = options.arch + ' '
 
   buildbot_common.BuildStep(build_prefix + 'Clean Old SDK')
   buildbot_common.MakeDir(MONO_BUILD_DIR)
   buildbot_common.RemoveDir(os.path.join(MONO_BUILD_DIR, 'pepper_*'))
@@ skipping 84 matching lines @@
   # TODO(elijahtaylor,olonho): Re-enable tests on arm when they compile/run.
   if options.arch != 'arm':
     buildbot_common.BuildStep(build_prefix + 'Test Mono')
     buildbot_common.Run(['make', 'check', '-j8'],
         cwd=os.path.join(SDK_BUILD_DIR, arch_to_output_folder[options.arch]))
 
   return 0
 
 
 if __name__ == '__main__':
-  sys.exit(main(sys.argv))
+  sys.exit(main(sys.argv[1:]))