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

components/sync/core/activation_context.h

-// Copyright 2015 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_ACTIVATION_CONTEXT_H_
-#define COMPONENTS_SYNC_CORE_ACTIVATION_CONTEXT_H_
-
-#include <memory>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/sequenced_task_runner.h"
-#include "components/sync/core/model_type_processor.h"
-#include "components/sync/core/non_blocking_sync_common.h"
-#include "components/sync/protocol/model_type_state.pb.h"
-
-namespace syncer {
-
-// The state passed from ModelTypeProcessor to Sync thread during DataType
-// activation.
-struct ActivationContext {
-  ActivationContext();
-  ~ActivationContext();
-
-  // Initial ModelTypeState at the moment of activation.
-  sync_pb::ModelTypeState model_type_state;
-
-  // The ModelTypeProcessor for the worker. Note that this is owned because
-  // it is generally a proxy object to the real processor.
-  std::unique_ptr<ModelTypeProcessor> type_processor;
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_CORE_ACTIVATION_CONTEXT_H_