Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/offline_pages/downloads/download_ui_adapter.cc

Index: components/offline_pages/downloads/download_ui_adapter.cc
diff --git a/components/offline_pages/downloads/download_ui_adapter.cc b/components/offline_pages/downloads/download_ui_adapter.cc
index df7be3489f6bca4d4498821a4729b23d6b1efd25..0f97841e3dbd6fcffc9924ceb33e5e12201f6e96 100644
--- a/components/offline_pages/downloads/download_ui_adapter.cc
+++ b/components/offline_pages/downloads/download_ui_adapter.cc
@@ -80,7 +80,8 @@ 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,