Standardize usage of virtual/override/final in ui/

ui/base/models/list_model_unittest.cc

Index: ui/base/models/list_model_unittest.cc
diff --git a/ui/base/models/list_model_unittest.cc b/ui/base/models/list_model_unittest.cc
index 8422a124fb6f30e6d027f3a6854b21c1291d0a66..8075a4a0e69e7852e51946bd8cffeefae71f2d4a 100644
--- a/ui/base/models/list_model_unittest.cc
+++ b/ui/base/models/list_model_unittest.cc
@@ -47,16 +47,16 @@ class ListModelTest : public testing::Test,
   }
 
   // ListModelObserver implementation:
-  virtual void ListItemsAdded(size_t start, size_t count) override {
+  void ListItemsAdded(size_t start, size_t count) override {
     added_count_ += count;
   }
-  virtual void ListItemsRemoved(size_t start, size_t count) override {
+  void ListItemsRemoved(size_t start, size_t count) override {
     removed_count_ += count;
   }
-  virtual void ListItemMoved(size_t index, size_t target_index) override {
+  void ListItemMoved(size_t index, size_t target_index) override {
     ++moved_count_;
   }
-  virtual void ListItemsChanged(size_t start, size_t count) override {
+  void ListItemsChanged(size_t start, size_t count) override {
     changed_count_ += count;
   }