Remove svn support from smaller git extensions

git_drover.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 """git drover: A tool for merging changes to release branches."""
 
 import argparse
 import cPickle
 import functools
 import logging
@@ skipping 196 matching lines @@
   FILES_TO_LINK = [
       'refs',
       'logs/refs',
       'info/refs',
       'info/exclude',
       'objects',
       'hooks',
       'packed-refs',
       'remotes',
       'rr-cache',
-      'svn',
   ]
   FILES_TO_COPY = ['config', 'HEAD']
 
   def _create_checkout(self):
     """Creates a checkout to use for cherry-picking.
 
     This creates a checkout similarly to git-new-workdir. Most of the .git
     directory is shared with the |self._parent_repo| using symlinks. This
     differs from git-new-workdir in that the config is forked instead of shared.
     This is so the new workdir can be a sparse checkout without affecting
@@ skipping 214 matching lines @@
       cherry_pick_change(options.branch, options.cherry_pick,
                          options.parent_checkout, options.dry_run,
                          options.verbose)
   except Error as e:
     print 'Error:', e.message
     sys.exit(128)
 
 
 if __name__ == '__main__':
   main()