Remove svn support from smaller git extensions

git_common.py

 # Copyright 2014 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.
 
 # Monkeypatch IMapIterator so that Ctrl-C can kill everything properly.
 # Derived from https://gist.github.com/aljungberg/626518
 import multiprocessing.pool
 from multiprocessing.pool import IMapIterator
 def wrapper(func):
   def wrap(self, timeout=None):
@@ skipping 989 matching lines @@
   GIT_DIRECTORY_WHITELIST = [
     'config',
     'info',
     'hooks',
     'logs/refs',
     'objects',
     'packed-refs',
     'refs',
     'remotes',
     'rr-cache',
-    'svn'
   ]
   make_workdir_common(repository, new_workdir, GIT_DIRECTORY_WHITELIST,
                       ['HEAD'])
 
 
 def clone_file(repository, new_workdir, link, operation):
   if not os.path.exists(os.path.join(repository, link)):
     return
   link_dir = os.path.dirname(os.path.join(new_workdir, link))
   if not os.path.exists(link_dir):
     os.makedirs(link_dir)
   operation(os.path.join(repository, link), os.path.join(new_workdir, link))