Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/offline_pages/downloads/download_ui_adapter_unittest.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/offline_pages/downloads/download_ui_adapter.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
@@ skipping 90 matching lines @@
                                       page.second.client_id);
         pages.erase(page.first);
         return;
       }
     }
   }
 
   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, page);
   }
 
   ClientPolicyController* GetPolicyController() override {
     return policy_controller_.get();
   }
 
   // Normally, OfflinePageModel owns this adapter, so lets test it this way.
   std::unique_ptr<DownloadUIAdapter> adapter;
 
   std::map<int64_t, OfflinePageItem> pages;
@@ skipping 174 matching lines @@
   model->adapter->RemoveObserver(this);
   // This will complete async fetch of items, but...
   PumpLoop();
   // items should not be loaded when there is no observers!
   EXPECT_FALSE(items_loaded);
   // This should not crash.
   model->adapter->AddObserver(this);
 }
 
 }  // namespace offline_pages