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

components/sync/engine/ui_model_worker.h

Index: components/sync/engine/ui_model_worker.h
diff --git a/components/sync/driver/glue/ui_model_worker.h b/components/sync/engine/ui_model_worker.h
similarity index 87%
rename from components/sync/driver/glue/ui_model_worker.h
rename to components/sync/engine/ui_model_worker.h
index c3f76946a1fe0fa0b0e44eab19723e1bc047d1e0..c158e2a5cbcc14471bf839b1ecdf8101a0541c15 100644
--- a/components/sync/driver/glue/ui_model_worker.h
+++ b/components/sync/engine/ui_model_worker.h
@@ -2,8 +2,8 @@
 // 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_UI_MODEL_WORKER_H_
-#define COMPONENTS_SYNC_DRIVER_GLUE_UI_MODEL_WORKER_H_
+#ifndef COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_
+#define COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -37,4 +37,4 @@ class UIModelWorker : public ModelSafeWorker {
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_DRIVER_GLUE_UI_MODEL_WORKER_H_
+#endif  // COMPONENTS_SYNC_ENGINE_UI_MODEL_WORKER_H_