Standardize usage of virtual/override/final in ui/

ui/app_list/app_list_item_list_unittest.cc

Index: ui/app_list/app_list_item_list_unittest.cc
diff --git a/ui/app_list/app_list_item_list_unittest.cc b/ui/app_list/app_list_item_list_unittest.cc
index 9b68ea41d71bf348c8350cad38452cb6a17fb288..dbdeed0b1146ea133fc995dec8b090d86a4c064b 100644
--- a/ui/app_list/app_list_item_list_unittest.cc
+++ b/ui/app_list/app_list_item_list_unittest.cc
@@ -19,21 +19,20 @@ class TestObserver : public AppListItemListObserver {
  public:
   TestObserver() : items_added_(0), items_removed_(0), items_moved_(0) {}
 
-  virtual ~TestObserver() {
-  }
+  ~TestObserver() override {}
 
   // AppListItemListObserver overriden:
-  virtual void OnListItemAdded(size_t index, AppListItem* item) override {
+  void OnListItemAdded(size_t index, AppListItem* item) override {
     ++items_added_;
   }
 
-  virtual void OnListItemRemoved(size_t index, AppListItem* item) override {
+  void OnListItemRemoved(size_t index, AppListItem* item) override {
     ++items_removed_;
   }
 
-  virtual void OnListItemMoved(size_t from_index,
-                               size_t to_index,
-                               AppListItem* item) override {
+  void OnListItemMoved(size_t from_index,
+                       size_t to_index,
+                       AppListItem* item) override {
     ++items_moved_;
   }