Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/offline_pages/downloads/download_ui_adapter_unittest.cc

Index: components/offline_pages/downloads/download_ui_adapter_unittest.cc
diff --git a/components/offline_pages/downloads/download_ui_adapter_unittest.cc b/components/offline_pages/downloads/download_ui_adapter_unittest.cc
index ef21b922942b9436bf2440e9e012cc73dac31a6c..d0fd069d44457ef43a55c40fc69a2acc47031d20 100644
--- a/components/offline_pages/downloads/download_ui_adapter_unittest.cc
+++ b/components/offline_pages/downloads/download_ui_adapter_unittest.cc
@@ -108,7 +108,7 @@ class MockOfflinePageModel : public StubOfflinePageModel {
   void AddPageAndNotifyAdapter(const OfflinePageItem& page) {
     EXPECT_EQ(pages.end(), pages.find(page.offline_id));
     pages[page.offline_id] = page;
-    observer_->OfflinePageModelChanged(this);
+    observer_->OfflinePageAdded(this, SavePageResult::SUCCESS, &page);
   }
 
   ClientPolicyController* GetPolicyController() override {