Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/background/cleanup_task.h

-// 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.
-
-#ifndef COMPONENTS_OFFLINE_PAGES_BACKGROUND_CLEANUP_TASK_H_
-#define COMPONENTS_OFFLINE_PAGES_BACKGROUND_CLEANUP_TASK_H_
-
-#include <memory>
-#include <vector>
-
-#include "base/memory/weak_ptr.h"
-#include "components/offline_pages/background/request_queue_results.h"
-#include "components/offline_pages/background/save_page_request.h"
-#include "components/offline_pages/core/task.h"
-
-namespace offline_pages {
-
-class OfflinerPolicy;
-class RequestCoordinatorEventLogger;
-class RequestNotifier;
-class RequestQueueStore;
-
-class CleanupTask : public Task {
- public:
-  CleanupTask(RequestQueueStore* store,
-              OfflinerPolicy* policy,
-              RequestNotifier* notifier,
-              RequestCoordinatorEventLogger* logger);
-  ~CleanupTask() override;
-
-  // TaskQueue::Task implementation, starts the async chain
-  void Run() override;
-
- private:
-  // Step 1. get results from the store
-  void GetRequests();
-
-  // Step 2. Prune stale requests
-  void Prune(bool success,
-             std::vector<std::unique_ptr<SavePageRequest>> requests);
-
-  // Step 3. Send delete notifications for the expired requests.
-  void OnRequestsExpired(std::unique_ptr<UpdateRequestsResult> result);
-
-  // Build a list of IDs whose request has expired.
-  void GetExpiredRequestIds(
-      std::vector<std::unique_ptr<SavePageRequest>> requests,
-      std::vector<int64_t>* expired_request_ids);
-
-  // Member variables, all pointers are not owned here.
-  RequestQueueStore* store_;
-  OfflinerPolicy* policy_;
-  RequestNotifier* notifier_;
-  RequestCoordinatorEventLogger* event_logger_;
-  // Allows us to pass a weak pointer to callbacks.
-  base::WeakPtrFactory<CleanupTask> weak_ptr_factory_;
-};
-
-}  // namespace offline_pages
-
-#endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_CLEANUP_TASK_H_