Remove dependency on server generated type root folders

sync/engine/directory_update_handler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
 #define SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 73 matching lines @@
   // Its type must match this update handler's type.
   void UpdateProgressMarker(
       const sync_pb::DataTypeProgressMarker& progress_marker);
 
   bool IsValidProgressMarker(
       const sync_pb::DataTypeProgressMarker& progress_marker) const;
 
   // 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_;
   DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
 
   scoped_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_