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

components/offline_pages/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"
-
-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