Don't send mode flag to clobber command.

scripts/slave/dart/dart_util.py

 #!/usr/bin/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.
 
 """Utils for the dart project.
 """
 
 import optparse
 import subprocess
 import sys
 
 def clobber():
   cmd = [sys.executable,
-         './tools/clean_output_directory.py',
-         '--mode=all']
+         './tools/clean_output_directory.py']
   print 'Clobbering %s' % (' '.join(cmd))
   return subprocess.call(cmd)
 
 def main():
   parser = optparse.OptionParser()
   parser.add_option('',
                     '--clobber',
                     default=False,
                     action='store_true',
                     help='Clobber the builder')
   options, args = parser.parse_args()
 
   # args unused, use.
   args.append('')
 
   # Determine what to do based on options passed in.
   if options.clobber:
     return clobber()
   else:
     print("Nothing to do")
 
 
 if '__main__' == __name__ :
   sys.exit(main())