Standardize usage of virtual/override/final specifiers in ui/.

ui/touch_selection/touch_selection_controller_unittest.cc

Index: ui/touch_selection/touch_selection_controller_unittest.cc
diff --git a/ui/touch_selection/touch_selection_controller_unittest.cc b/ui/touch_selection/touch_selection_controller_unittest.cc
index 7bfc6c25dff02bf0df559448b8bd3f511a44b00d..bdbde62cedb918fe3c94406b62391acb6a297bb3 100644
--- a/ui/touch_selection/touch_selection_controller_unittest.cc
+++ b/ui/touch_selection/touch_selection_controller_unittest.cc
@@ -79,7 +79,7 @@ class TouchSelectionControllerTest : public testing::Test,
     selection_end_ = extent;
   }
 
-  virtual void MoveRangeSelectionExtent(const gfx::PointF& extent) override {
+  void MoveRangeSelectionExtent(const gfx::PointF& extent) override {
     selection_moved_ = true;
     selection_end_ = extent;
   }