[Sync] Move the last things out of core/.

components/sync/core_impl/model_type_connector_proxy.h

-// 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.
-
-#ifndef COMPONENTS_SYNC_CORE_IMPL_MODEL_TYPE_CONNECTOR_PROXY_H_
-#define COMPONENTS_SYNC_CORE_IMPL_MODEL_TYPE_CONNECTOR_PROXY_H_
-
-#include <memory>
-
-#include "base/memory/weak_ptr.h"
-#include "base/sequenced_task_runner.h"
-#include "components/sync/base/model_type.h"
-#include "components/sync/core/model_type_connector.h"
-
-namespace syncer {
-
-// Proxies all ModelTypeConnector calls to another thread. Typically used by
-// the SyncBackend to call from the UI thread to the real ModelTypeConnector on
-// the sync thread.
-class ModelTypeConnectorProxy : public ModelTypeConnector {
- public:
-  ModelTypeConnectorProxy(
-      const scoped_refptr<base::SequencedTaskRunner>& task_runner,
-      const base::WeakPtr<ModelTypeConnector>& model_type_connector);
-  ~ModelTypeConnectorProxy() override;
-
-  // ModelTypeConnector implementation
-  void ConnectType(
-      ModelType type,
-      std::unique_ptr<ActivationContext> activation_context) override;
-  void DisconnectType(ModelType type) override;
-
- private:
-  // A SequencedTaskRunner representing the thread where the ModelTypeConnector
-  // lives.
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-
-  // The ModelTypeConnector this object is wrapping.
-  base::WeakPtr<ModelTypeConnector> model_type_connector_;
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_CORE_IMPL_MODEL_TYPE_CONNECTOR_PROXY_H_