Fix typo

tools/get_drt.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2011, 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.
 
 # Gets or updates a DumpRenderTree (a nearly headless build of chrome). This is
 # used for running browser tests of client applications.
 
 import os
@@ skipping 130 matching lines @@
   # download the zip file to a temporary path, and unzip to the target location
   temp_dir = tempfile.mkdtemp()
   try:
     temp_zip = temp_dir + '/drt.zip'
     # It's nice to show download progress
     gsutil_visible('cp', latest, temp_zip)
 
     result, out = execute_command('unzip', temp_zip, '-d', temp_dir)
     if result != 0:
       raise Exception('Execution of "unzip %s -d %s" failed: %s' %
-                      (temp_zip, temp_dir, str(output)))
+                      (temp_zip, temp_dir, str(out)))
     unzipped_dir = temp_dir + '/' + os.path.basename(latest)[:-4] # remove .zip
     shutil.move(unzipped_dir, DRT_DIR)
   finally:
     shutil.rmtree(temp_dir)
 
   # create the version stamp
   v = open(VERSION, 'w')
   v.write(latest)
   v.close()
 
   print 'Successfully downloaded to %s' % DRT_DIR
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())