[Sync] Move //components/sync to the syncer namespace.

components/sync/driver/ui_model_type_controller.cc

 // Copyright 2016 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 "components/sync/driver/ui_model_type_controller.h"
 
 #include "components/sync/api/model_type_service.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/core/activation_context.h"
 #include "components/sync/driver/sync_client.h"
 
-namespace sync_driver_v2 {
+namespace syncer {
 
-using sync_driver::SyncClient;
-
-UIModelTypeController::UIModelTypeController(syncer::ModelType type,
+UIModelTypeController::UIModelTypeController(ModelType type,
                                              const base::Closure& dump_stack,
                                              SyncClient* sync_client)
     : NonBlockingDataTypeController(type, dump_stack, sync_client) {}
 
 UIModelTypeController::~UIModelTypeController() {}
 
 bool UIModelTypeController::RunOnModelThread(
     const tracked_objects::Location& from_here,
     const base::Closure& task) {
   DCHECK(CalledOnValidThread());
   task.Run();
   return true;
 }
 
-}  // namespace sync_driver_v2
+}  // namespace syncer