Remove dependency on server generated type root folders

sync/engine/directory_update_handler.h

Index: sync/engine/directory_update_handler.h
diff --git a/sync/engine/directory_update_handler.h b/sync/engine/directory_update_handler.h
index 230fbc3fbe05d58a201b6de63d29709a369b347f..246d412a87d274f12487b9ff89da2168284dda57 100644
--- a/sync/engine/directory_update_handler.h
+++ b/sync/engine/directory_update_handler.h
@@ -91,6 +91,9 @@ class SYNC_EXPORT_PRIVATE DirectoryUpdateHandler : public UpdateHandler {
   // Skips all checks and goes straight to applying the updates.
   SyncerError ApplyUpdatesImpl(sessions::StatusController* status);
 
+  // Creates root node for the handled model type.
+  void CreateTypeRoot(syncable::ModelNeutralWriteTransaction* trans);
+
   syncable::Directory* dir_;
   ModelType type_;
   scoped_refptr<ModelSafeWorker> worker_;