Add a couple of notifications related settings to app/extensions sync:

chrome/browser/sync/protocol/proto_value_conversions.cc

Index: chrome/browser/sync/protocol/proto_value_conversions.cc
===================================================================
--- chrome/browser/sync/protocol/proto_value_conversions.cc	(revision 107300)
+++ chrome/browser/sync/protocol/proto_value_conversions.cc	(working copy)
@@ -102,6 +102,14 @@
   return value;
 }
 
+DictionaryValue* AppSettingsToValue(
+    const sync_pb::AppNotificationSettings& proto) {
+  DictionaryValue* value = new DictionaryValue();
+  SET_BOOL(initial_setup_done);
+  SET_BOOL(disabled);
+  return value;
+}
+
 DictionaryValue* SessionHeaderToValue(
     const sync_pb::SessionHeader& proto) {
   DictionaryValue* value = new DictionaryValue();
@@ -182,6 +190,7 @@
     const sync_pb::AppSpecifics& proto) {
   DictionaryValue* value = new DictionaryValue();
   SET(extension, ExtensionSpecificsToValue);
+  SET(notification_settings, AppSettingsToValue);
   return value;
 }