Docserver: Make the hand-written Cron methods run first rather than last, since

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 9364d72d5b9bb117a211e716887d087b69610819..a6b440ed4e3332c7204258643524a3677d5d7aed 100644
--- a/chrome/common/extensions/docs/server2/sidenav_data_source.py
+++ b/chrome/common/extensions/docs/server2/sidenav_data_source.py
@@ -80,8 +80,7 @@ class SidenavDataSource(DataSource):
     futures = [
         self._cache.GetFromFile('%s/%s_sidenav.json' % (JSON_PATH, platform))
         for platform in ('apps', 'extensions')]
-    for future in futures:
-      future.Get()
+    return Future(delegate=Gettable(lambda: [f.Get() for f in futures]))
 
   def get(self, key):
     sidenav = copy.deepcopy(self._cache.GetFromFile(