Standardize usage of virtual/override/final in ui/

ui/app_list/test/app_list_test_model.h

Index: ui/app_list/test/app_list_test_model.h
diff --git a/ui/app_list/test/app_list_test_model.h b/ui/app_list/test/app_list_test_model.h
index d2a1845dd10aa15ad1762766e6b325aff27a50bd..43a79ab34ea577d1b2e0af8ae80a267a579a712a 100644
--- a/ui/app_list/test/app_list_test_model.h
+++ b/ui/app_list/test/app_list_test_model.h
@@ -21,9 +21,9 @@ class AppListTestModel : public AppListModel {
   class AppListTestItem : public AppListItem {
    public:
     AppListTestItem(const std::string& id, AppListTestModel* model);
-    virtual ~AppListTestItem();
-    virtual void Activate(int event_flags) override;
-    virtual const char* GetItemType() const override;
+    ~AppListTestItem() override;
+    void Activate(int event_flags) override;
+    const char* GetItemType() const override;
 
     void SetPosition(const syncer::StringOrdinal& new_position);