Docserver: Add @Cache annotation to CompiledFileSystem

chrome/common/extensions/docs/server2/sidenav_data_source_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 json
 import unittest
 import copy
 
 from extensions_paths import JSON_TEMPLATES
@@ skipping 131 matching lines @@
   def testCron(self):
     file_system = TestFileSystem({
       'chrome_sidenav.json': '[{ "title": "H1" }]'
     }, relative_to=JSON_TEMPLATES)
 
     # Ensure Cron doesn't rely on request.
     sidenav_data_source = SidenavDataSource(
         ServerInstance.ForTest(file_system), request=None)
     sidenav_data_source.Cron().Get()
 
-    # If Cron fails, chrome_sidenav.json will not be cached, and the _cache_data
+    # If Cron fails, chrome_sidenav.json will not be cached, and the cache_data
     # access will fail.
     # TODO(jshumway): Make a non hack version of this check.
     sidenav_data_source._cache._file_object_store.Get(
-        '%schrome_sidenav.json' % JSON_TEMPLATES).Get()._cache_data
+        '%schrome_sidenav.json' % JSON_TEMPLATES).Get().cache_data
 
 
 if __name__ == '__main__':
   unittest.main()