Docserver: Include <h4> tags in the table of contents, it's needed for the API

chrome/common/extensions/docs/server2/template_renderer_test.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 import unittest
 
 from server_instance import ServerInstance
 from third_party.handlebar import Handlebar
 
 
 class TemplateRendererTest(unittest.TestCase):
   '''Basic test for TemplateRenderer.
 
   When the DataSourceRegistry conversion is finished then we could do some more
   meaningful tests by injecting a different set of DataSources.
   '''
 
   def setUp(self):
     self._template_renderer = ServerInstance.ForLocal().template_renderer
 
   def testSimpleWiring(self):
     template = Handlebar('hello {{?true}}{{strings.extension}}{{/}}')
-    self.assertEqual('hello extension',
-                     self._template_renderer.Render(template, None))
+    text, warnings = self._template_renderer.Render(template, None)
+    self.assertEqual('hello extension', text)
+    self.assertEqual([], warnings)
 
 
 if __name__ == '__main__':
   unittest.main()