Docserver: SidenavDataSource refactor, transition to DataSourceRegistry

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

 # 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.
 
 from data_source import DataSource
 from third_party.json_schema_compiler.json_parse import Parse
 
 class StringsDataSource(DataSource):
   '''Provides templates with access to a key to string mapping defined in a
   JSON configuration file.
   '''
-  def __init__(self, server_instance):
+  def __init__(self, server_instance, _):
     self._cache = server_instance.compiled_host_fs_factory.Create(
         lambda _, strings_json: Parse(strings_json), StringsDataSource)
     self._strings_json_path = server_instance.strings_json_path
 
   def Cron(self):
     self._cache.GetFromFile(self._strings_json_path)
 
   def get(self, key):
     return self._cache.GetFromFile(self._strings_json_path)[key]