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

components/offline_pages/core/background/mark_attempt_started_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_MARK_ATTEMPT_STARTED_TASK_H_
-#define COMPONENTS_OFFLINE_PAGES_BACKGROUND_MARK_ATTEMPT_STARTED_TASK_H_
+#ifndef COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_MARK_ATTEMPT_STARTED_TASK_H_
+#define COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_MARK_ATTEMPT_STARTED_TASK_H_
 
 #include <stdint.h>
 
-#include "components/offline_pages/background/update_request_task.h"
+#include "components/offline_pages/core/background/update_request_task.h"
 #include "components/offline_pages/core/task.h"
 
 namespace offline_pages {
 
 class RequestQueueStore;
 
 class MarkAttemptStartedTask : public UpdateRequestTask {
  public:
   MarkAttemptStartedTask(RequestQueueStore* store,
                          int64_t request_id,
                          const RequestQueueStore::UpdateCallback& callback);
   ~MarkAttemptStartedTask() override;
 
  protected:
   // UpdateRequestTask implementation:
   void UpdateRequestImpl(std::unique_ptr<UpdateRequestsResult> result) override;
 };
 
 }  // namespace offline_pages
 
-#endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_MARK_ATTEMPT_STARTED_TASK_H_
+#endif  // COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_MARK_ATTEMPT_STARTED_TASK_H_