Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/offline_pages/core/downloads/download_ui_adapter.cc

Index: components/offline_pages/core/downloads/download_ui_adapter.cc
diff --git a/components/offline_pages/core/downloads/download_ui_adapter.cc b/components/offline_pages/core/downloads/download_ui_adapter.cc
index 92707e235ead5dc3e5ddb788ef1a6032cd4a8aa2..053dce7d0986229bee58e87a6022db2e4435e844 100644
--- a/components/offline_pages/core/downloads/download_ui_adapter.cc
+++ b/components/offline_pages/core/downloads/download_ui_adapter.cc
@@ -79,7 +79,8 @@ void DownloadUIAdapter::OfflinePageModelLoaded(OfflinePageModel* model) {
   // This signal is not used here.
 }
 
-void DownloadUIAdapter::OfflinePageModelChanged(OfflinePageModel* model) {
+void DownloadUIAdapter::OfflinePageAdded(OfflinePageModel* model,
+                                         const OfflinePageItem& added_page) {
   DCHECK(model == model_);
   model_->GetAllPages(base::Bind(&DownloadUIAdapter::OnOfflinePagesChanged,
                                  weak_ptr_factory_.GetWeakPtr()));