Refactor the devserver to make it easier to control caching

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

Index: chrome/common/extensions/docs/server2/sidenav_data_source.py
diff --git a/chrome/common/extensions/docs/server2/sidenav_data_source.py b/chrome/common/extensions/docs/server2/sidenav_data_source.py
index e51fa476c1356eb0c9d301f0f5ce782808646950..be3cc491a661952bf84537ba0c1cdf90013adcf1 100644
--- a/chrome/common/extensions/docs/server2/sidenav_data_source.py
+++ b/chrome/common/extensions/docs/server2/sidenav_data_source.py
@@ -10,14 +10,18 @@ import compiled_file_system as compiled_fs
 from file_system import FileNotFoundError
 from third_party.json_schema_compiler.model import UnixName
 
+# Increment this if the data model changes for SidenavDataSource.
+_VERSION = 1
+
 class SidenavDataSource(object):
   """This class reads in and caches a JSON file representing the side navigation
   menu.
   """
   class Factory(object):
-    def __init__(self, cache_factory, json_path):
-      self._cache = cache_factory.Create(self._CreateSidenavDict,
-                                         compiled_fs.SIDENAV)
+    def __init__(self, compiled_fs_factory, json_path):
+      self._cache = compiled_fs_factory.Create(self._CreateSidenavDict,
+                                               SidenavDataSource,
+                                               version=_VERSION)
       self._json_path = json_path
 
     def Create(self, path):