Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.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/ntp_snippets/offline_pages/recent_tab_suggestions_provider.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 190 matching lines @@
     }
 
     suggestions.push_back(ConvertOfflinePage(item));
   }
   callback.Run(std::move(suggestions));
 }
 
 void RecentTabSuggestionsProvider::OfflinePageModelLoaded(
     offline_pages::OfflinePageModel* model) {}
 
-void RecentTabSuggestionsProvider::OfflinePageModelChanged(
-    offline_pages::OfflinePageModel* model) {
+void RecentTabSuggestionsProvider::OfflinePageAdded(
+    offline_pages::OfflinePageModel* model,
+    const offline_pages::OfflinePageItem& added_page) {
   DCHECK_EQ(offline_page_model_, model);
   FetchRecentTabs();
 }
 
 void RecentTabSuggestionsProvider::
     GetPagesMatchingQueryCallbackForFetchRecentTabs(
         const std::vector<OfflinePageItem>& offline_pages) {
   NotifyStatusChanged(CategoryStatus::AVAILABLE);
   std::set<std::string> old_dismissed_ids = ReadDismissedIDsFromPrefs();
   std::set<std::string> new_dismissed_ids;
@@ skipping 113 matching lines @@
 }
 
 void RecentTabSuggestionsProvider::StoreDismissedIDsToPrefs(
     const std::set<std::string>& dismissed_ids) {
   prefs::StoreDismissedIDsToPrefs(pref_service_,
                                   prefs::kDismissedRecentOfflineTabSuggestions,
                                   dismissed_ids);
 }
 
 }  // namespace ntp_snippets