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

components/offline_pages/core/offline_page_model_event_logger.cc

 // 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.
 
-#include "components/offline_pages/offline_page_model_event_logger.h"
+#include "components/offline_pages/core/offline_page_model_event_logger.h"
 
 namespace offline_pages {
 
 void OfflinePageModelEventLogger::RecordPageSaved(const std::string& name_space,
                                                   const std::string& url,
                                                   const std::string& id) {
   RecordActivity(url + " is saved at " + name_space + " with id " + id);
 }
 
 void OfflinePageModelEventLogger::RecordPageDeleted(const std::string& id) {
   RecordActivity("Page with ID " + id + " has been deleted");
 }
 
 void OfflinePageModelEventLogger::RecordPageExpired(const std::string& id) {
   RecordActivity("Page with ID " + id + " has been expired");
 }
 
 void OfflinePageModelEventLogger::RecordStoreClearError() {
   RecordActivity("Offline store clear failed");
 }
 
 void OfflinePageModelEventLogger::RecordStoreCleared() {
   RecordActivity("Offline store cleared");
 }
 
 void OfflinePageModelEventLogger::RecordStoreReloadError() {
   RecordActivity("There was an error reloading the offline store");
 }
 }  // namespace offline_pages