[Sync] Move //sync to //components/sync.

sync/internal_api/public/engine/passive_model_worker.h

-// Copyright (c) 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 SYNC_INTERNAL_API_PUBLIC_ENGINE_PASSIVE_MODEL_WORKER_H_
-#define SYNC_INTERNAL_API_PUBLIC_ENGINE_PASSIVE_MODEL_WORKER_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "sync/base/sync_export.h"
-#include "sync/internal_api/public/engine/model_safe_worker.h"
-#include "sync/internal_api/public/util/syncer_error.h"
-
-namespace syncer {
-
-// Implementation of ModelSafeWorker for passive types.  All work is
-// done on the same thread DoWorkAndWaitUntilDone (i.e., the sync
-// thread).
-class SYNC_EXPORT PassiveModelWorker : public ModelSafeWorker {
- public:
-  explicit PassiveModelWorker(WorkerLoopDestructionObserver* observer);
-
-  // ModelSafeWorker implementation. Called on the sync thread.
-  void RegisterForLoopDestruction() override;
-  ModelSafeGroup GetModelSafeGroup() override;
-
- protected:
-  SyncerError DoWorkAndWaitUntilDoneImpl(const WorkCallback& work) override;
-
- private:
-  ~PassiveModelWorker() override;
-
-  DISALLOW_COPY_AND_ASSIGN(PassiveModelWorker);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_INTERNAL_API_PUBLIC_ENGINE_PASSIVE_MODEL_WORKER_H_