Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/ntp_snippets/offline_pages/offline_page_proxy.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_NTP_SNIPPETS_OFFLINE_PAGES_PROXY_OFFLINE_PAGE_PROXY_H_
 #define COMPONENTS_NTP_SNIPPETS_OFFLINE_PAGES_PROXY_OFFLINE_PAGE_PROXY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 42 matching lines @@
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
  private:
   friend class base::RefCounted<OfflinePageProxy>;
 
   ~OfflinePageProxy() override;
 
   // OfflinePageModel::Observer implementation.
   void OfflinePageModelLoaded(offline_pages::OfflinePageModel* model) override;
-  void OfflinePageModelChanged(offline_pages::OfflinePageModel* model) override;
+  void OfflinePageAdded(offline_pages::OfflinePageModel* model,
+                        offline_pages::SavePageResult result,
+                        const offline_pages::OfflinePageItem* item) override;
   void OfflinePageDeleted(int64_t offline_id,
                           const offline_pages::ClientId& client_id) override;
 
   // Queries the OfflinePageModel for offline pages and notifies observers
   // through |OfflinePageModelChanged|.
   void FetchOfflinePagesAndNotify();
 
   // Callback from the |OfflinePageModel::GetAllPages|.
   void OnOfflinePagesLoaded(
       const offline_pages::MultipleOfflinePageItemResult& result);
 
   offline_pages::OfflinePageModel* offline_page_model_;
   base::ObserverList<Observer> observers_;
   base::WeakPtrFactory<OfflinePageProxy> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageProxy);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_OFFLINE_PAGES_PROXY_OFFLINE_PAGE_PROXY_H_