Rev the version of apache ant in third_party to 1.8.4. This will fix an issue with

editor/build/build.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import glob
 import optparse
 import os
 import re
@@ skipping 195 matching lines @@
     print 'Script pathname not known, giving up.'
     return 1
 
   scriptdir = os.path.abspath(os.path.dirname(sys.argv[0]))
   editorpath = os.path.abspath(os.path.join(scriptdir, '..'))
   thirdpartypath = os.path.abspath(os.path.join(scriptdir, '..', '..',
                                                 'third_party'))
   toolspath = os.path.abspath(os.path.join(scriptdir, '..', '..',
                                            'tools'))
   dartpath = os.path.abspath(os.path.join(scriptdir, '..', '..'))
-  antpath = os.path.join(thirdpartypath, 'apache_ant', 'v1_7_1')
+  antpath = os.path.join(thirdpartypath, 'apache_ant', '1.8.4')
   bzip2libpath = os.path.join(thirdpartypath, 'bzip2')
   buildpath = os.path.join(editorpath, 'tools', 'features',
                            'com.google.dart.tools.deploy.feature_releng')
   utils = GetUtils(toolspath)
   buildos = utils.GuessOS()
 
   BUILD_OS = utils.GuessOS()
   DART_PATH = dartpath
   TOOLS_PATH = toolspath
   
@@ skipping 831 matching lines @@
   """delete the given file - do not re-throw any exceptions that occur"""
   if os.path.exists(f):
     try:
       os.remove(f)
     except OSError:
       print 'error deleting %s' % f
 
 
 if __name__ == '__main__':
   sys.exit(main())