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

components/offline_pages/background/initialize_store_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_INITIALIZE_STORE_TASK_H_
-#define COMPONENTS_OFFLINE_PAGES_BACKGROUND_INITIALIZE_STORE_TASK_H_
-
-#include <stdint.h>
-
-#include "base/memory/weak_ptr.h"
-#include "components/offline_pages/background/request_queue_store.h"
-#include "components/offline_pages/core/task.h"
-
-namespace offline_pages {
-
-// Task performing a request queue store initialization and reset if one is
-// necessary. Reset is triggered in case the initialization fails. If reset
-// fails (perhaps not able to delete the folder or raze the database in case of
-// SQLite-backed store) a new attempt can be made. Number of attempts is limited
-// by |reset_attempts_left_|. Successful reset will be followed by another
-// attempt to initialize the database.
-//
-// Task is completed when either the store is correctly initialized or there are
-// not more reset attempts left.
-class InitializeStoreTask : public Task {
- public:
-  InitializeStoreTask(RequestQueueStore* store,
-                      const RequestQueueStore::InitializeCallback& callback);
-  ~InitializeStoreTask() override;
-
-  // TaskQueue::Task implementation.
-  void Run() override;
-
- private:
-  // Step 1. Initialize store.
-  void InitializeStore();
-  // Step 2a. Completes initialization if successful or tries to reset if there
-  // are more attempts left.
-  void CompleteIfSuccessful(bool success);
-  // Step 2b. Reset store in case initialization fails.
-  void TryToResetStore();
-  // Step 3. If 2b was successful go to step 1, else try 2b again.
-  void OnStoreResetDone(bool success);
-
-  // Store that this task initializes.
-  RequestQueueStore* store_;
-  // Number of attempts left to reset and reinitialize the store.
-  int reset_attempts_left_;
-  // Callback to complete the task.
-  RequestQueueStore::InitializeCallback callback_;
-
-  base::WeakPtrFactory<InitializeStoreTask> weak_ptr_factory_;
-  DISALLOW_COPY_AND_ASSIGN(InitializeStoreTask);
-};
-
-}  // namespace offline_pages
-
-#endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_INITIALIZE_STORE_TASK_H_