Make apply_issue.py more aggressive when deleting an entry from a DEPS file.

apply_issue.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.
 
 """Applies an issue from Rietveld.
 """
 
 import getpass
 import logging
@@ skipping 157 matching lines @@
     gclient_root = gclient_utils.FindGclientRoot(full_dir)
     if gclient_root and scm_type:
       print(
           'A DEPS file was updated inside a gclient checkout, running gclient '
           'sync.')
       base_rev = 'BASE' if scm_type == 'svn' else 'HEAD'
       gclient_path = os.path.join(BASE_DIR, 'gclient')
       if sys.platform == 'win32':
         gclient_path += '.bat'
       return subprocess.call(
-          [gclient_path, 'sync', '--revision', base_rev, '--nohooks'],
+          [
+            gclient_path, 'sync',
+            '--revision', base_rev,
+            '--nohooks',
+            '--delete_unversioned_trees',
+          ],
           cwd=gclient_root)
   return 0
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   sys.exit(main())