Standardize usage of virtual/override/final in cc/

cc/animation/layer_animation_controller_unittest.cc

Index: cc/animation/layer_animation_controller_unittest.cc
diff --git a/cc/animation/layer_animation_controller_unittest.cc b/cc/animation/layer_animation_controller_unittest.cc
index a5a29650b124f873bbb0c9b30b380567a894a58f..96c406c3af1006f6167dccce9ebcebbd47fc9f0a 100644
--- a/cc/animation/layer_animation_controller_unittest.cc
+++ b/cc/animation/layer_animation_controller_unittest.cc
@@ -859,16 +859,15 @@ class FakeAnimationDelegate : public AnimationDelegate {
       : started_(false),
         finished_(false) {}
 
-  virtual void NotifyAnimationStarted(TimeTicks monotonic_time,
-                                      Animation::TargetProperty target_property,
-                                      int group) override {
+  void NotifyAnimationStarted(TimeTicks monotonic_time,
+                              Animation::TargetProperty target_property,
+                              int group) override {
     started_ = true;
   }
 
-  virtual void NotifyAnimationFinished(
-      TimeTicks monotonic_time,
-      Animation::TargetProperty target_property,
-      int group) override {
+  void NotifyAnimationFinished(TimeTicks monotonic_time,
+                               Animation::TargetProperty target_property,
+                               int group) override {
     finished_ = true;
   }