[Offline Pages] Convert Download UI Adapter to using OfflinePageAdded

components/offline_pages/core/downloads/download_ui_adapter.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_CORE_DOWNLOADS_DOWNLOAD_UI_ADAPTER_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_DOWNLOADS_DOWNLOAD_UI_ADAPTER_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 90 matching lines @@
   };
 
   typedef std::map<std::string, std::unique_ptr<ItemInfo>> DownloadUIItems;
 
   void LoadCache();
   void ClearCache();
 
   // Task callbacks.
   void OnOfflinePagesLoaded(const MultipleOfflinePageItemResult& pages);
   void NotifyItemsLoaded(Observer* observer);
-  void OnOfflinePagesChanged(const MultipleOfflinePageItemResult& pages);
   void OnDeletePagesDone(DeletePageResult result);
 
   // Always valid, this class is a member of the model.
   OfflinePageModel* model_;
 
   State state_;
 
   // The cache of UI items. The key is DownloadUIItem.guid.
   DownloadUIItems items_;
 
   // The observers.
   base::ObserverList<Observer> observers_;
   int observers_count_;
 
   base::WeakPtrFactory<DownloadUIAdapter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadUIAdapter);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGE_DOWNLOADS_DOWNLOAD_UI_ADAPTER_H_