Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/app_list/model_pref_updater_unittest.cc

Index: chrome/browser/ui/app_list/model_pref_updater_unittest.cc
diff --git a/chrome/browser/ui/app_list/model_pref_updater_unittest.cc b/chrome/browser/ui/app_list/model_pref_updater_unittest.cc
index 19f7a3ce64e62928526db3f13516c3613d19738f..9eae550769f0924c10fa67784ef92546f841f8bc 100644
--- a/chrome/browser/ui/app_list/model_pref_updater_unittest.cc
+++ b/chrome/browser/ui/app_list/model_pref_updater_unittest.cc
@@ -18,9 +18,9 @@ namespace test {
 class TestExtensionAppItem : public AppListItem {
  public:
   explicit TestExtensionAppItem(const std::string& id) : AppListItem(id) {}
-  virtual ~TestExtensionAppItem() {}
+  ~TestExtensionAppItem() override {}
 
-  virtual const char* GetItemType() const override {
+  const char* GetItemType() const override {
     return ExtensionAppItem::kItemType;
   }