[Sync] Move sync's ModelSafeWorker implementations to engine/.

components/sync/engine/browser_thread_model_worker.h

 // Copyright 2012 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 COMPONENTS_SYNC_DRIVER_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
-#define COMPONENTS_SYNC_DRIVER_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
+#ifndef COMPONENTS_SYNC_ENGINE_BROWSER_THREAD_MODEL_WORKER_H_
+#define COMPONENTS_SYNC_ENGINE_BROWSER_THREAD_MODEL_WORKER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "components/sync/base/scoped_event_signal.h"
 #include "components/sync/base/syncer_error.h"
 #include "components/sync/engine/model_safe_worker.h"
 
 namespace syncer {
 
@@ skipping 22 matching lines @@
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> runner_;
   ModelSafeGroup group_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThreadModelWorker);
 };
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_DRIVER_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
+#endif  // COMPONENTS_SYNC_ENGINE_BROWSER_THREAD_MODEL_WORKER_H_