[Sync] rename USS processor / worker interfaces

sync/engine/model_type_sync_worker.cc

Index: sync/engine/model_type_sync_worker.cc
diff --git a/sync/engine/model_type_sync_worker.cc b/sync/engine/model_type_sync_worker.cc
deleted file mode 100644
index 15b3687a5a553bfdb3e21fb11e885d3894caa85d..0000000000000000000000000000000000000000
--- a/sync/engine/model_type_sync_worker.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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.
-
-#include "sync/engine/model_type_sync_worker.h"
-
-namespace syncer_v2 {
-
-ModelTypeSyncWorker::ModelTypeSyncWorker() {
-}
-
-ModelTypeSyncWorker::~ModelTypeSyncWorker() {
-}
-
-}  // namespace syncer