set tab length to 2

tools/md_browser/md_browser.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.
 
 """Simple Markdown browser for a Git checkout."""
 from __future__ import print_function
 
 import SimpleHTTPServer
 import SocketServer
@@ skipping 147 matching lines @@
     extension_configs = {
         'markdown.extensions.toc': {
             'slugify': _gitiles_slugify
         },
     }
 
     contents = self._Read(path[1:])
 
     md = markdown.Markdown(extensions=extensions,
                            extension_configs=extension_configs,
+                           tab_length=2,
                            output_format='html4')
 
     has_a_single_h1 = (len([line for line in contents.splitlines()
                             if (line.startswith('#') and
                                 not line.startswith('##'))]) == 1)
 
     md.treeprocessors['adjust_toc'] = _AdjustTOC(has_a_single_h1)
 
     md_fragment = md.convert(contents).encode('utf-8')
 
@@ skipping 128 matching lines @@
       contents.text = 'Contents'
       contents.tail = '\n'
       toc_aux = ElementTree.SubElement(toc_node, 'div', {'class': 'toc-aux'})
       toc_aux.text = '\n'
       toc_aux.append(ul_with_the_desired_toc_entries)
       toc_aux.tail = '\n'
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))