Standardize usage of virtual/override/final in ui/

ui/app_list/app_list_model_unittest.cc

Index: ui/app_list/app_list_model_unittest.cc
diff --git a/ui/app_list/app_list_model_unittest.cc b/ui/app_list/app_list_model_unittest.cc
index 91d744ece856e1a20322c6baa223fe0dcd57a620..c113ecafd6dc591d620a6d7f9572b854b5eb416b 100644
--- a/ui/app_list/app_list_model_unittest.cc
+++ b/ui/app_list/app_list_model_unittest.cc
@@ -29,25 +29,18 @@ class TestObserver : public AppListModelObserver {
         items_removed_(0),
         items_updated_(0) {
   }
-  virtual ~TestObserver() {
-  }
+  ~TestObserver() override {}
 
   // AppListModelObserver
-  virtual void OnAppListModelStatusChanged() override {
-    ++status_changed_count_;
-  }
+  void OnAppListModelStatusChanged() override { ++status_changed_count_; }
 
-  virtual void OnAppListItemAdded(AppListItem* item) override {
-    items_added_++;
-  }
+  void OnAppListItemAdded(AppListItem* item) override { items_added_++; }
 
-  virtual void OnAppListItemWillBeDeleted(AppListItem* item) override {
+  void OnAppListItemWillBeDeleted(AppListItem* item) override {
     items_removed_++;
   }
 
-  virtual void OnAppListItemUpdated(AppListItem* item) override {
-    items_updated_++;
-  }
+  void OnAppListItemUpdated(AppListItem* item) override { items_updated_++; }
 
   int status_changed_count() const { return status_changed_count_; }
   size_t items_added() { return items_added_; }