Extensions Docs Server: Generalize $ref's to work for any schema node

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

Index: chrome/common/extensions/docs/server2/intro_data_source.py
diff --git a/chrome/common/extensions/docs/server2/intro_data_source.py b/chrome/common/extensions/docs/server2/intro_data_source.py
index 4a30257697b66eb8a7f359db33030c046d7a710a..70992510bd5d3e5ea36da609166107035978fe23 100644
--- a/chrome/common/extensions/docs/server2/intro_data_source.py
+++ b/chrome/common/extensions/docs/server2/intro_data_source.py
@@ -13,7 +13,7 @@ from third_party.handlebar import Handlebar
 
 # Increment this version if there are changes to the table of contents dict that
 # IntroDataSource caches.
-_VERSION = 1
+_VERSION = 2
 
 _H1_REGEX = re.compile('<h1[^>.]*?>.*?</h1>', flags=re.DOTALL)
 
@@ -98,9 +98,6 @@ class IntroDataSource(object):
     self._cache = cache
     self._base_paths = base_paths
 
-  def __getitem__(self, key):
-    return self.get(key)
-
   def get(self, key):
     real_path = FormatKey(key)
     error = None