Correct $ref links in extensions documentation server relative location.

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

 # Copyright (c) 2012 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 HTMLParser import HTMLParser
 import logging
 import os
 import re
 
 from data_source import DataSource
@@ skipping 18 matching lines @@
     self._cache = server_instance.compiled_fs_factory.Create(
         server_instance.host_file_system_provider.GetTrunk(),
         self._MakeIntro,
         IntroDataSource)
     self._ref_resolver = server_instance.ref_resolver_factory.Create()
 
   def _MakeIntro(self, intro_path, intro):
     # Guess the name of the API from the path to the intro.
     api_name = os.path.splitext(intro_path.split('/')[-1])[0]
     return Handlebar(
-        self._ref_resolver.ResolveAllLinks(intro, namespace=api_name),
+        self._ref_resolver.ResolveAllLinks(intro,
+                                           relative_to=self._request.path,
+                                           namespace=api_name),
         name=intro_path)
 
   def get(self, key):
     path = FormatKey(key)
     def get_from_base_path(base_path):
       return self._cache.GetFromFile('%s/%s' % (base_path, path)).Get()
     base_paths = (INTROS_TEMPLATES, ARTICLES_TEMPLATES)
     for base_path in base_paths:
       try:
         return get_from_base_path(base_path)
       except FileNotFoundError:
         continue
     # Not found. Do the first operation again so that we get a stack trace - we
     # know that it'll fail.
     get_from_base_path(base_paths[0])
     raise AssertionError()
 
   def Cron(self):
     # TODO(kalman): Walk through the intros and articles directory.
     return Future(value=())