Standardize usage of virtual/override/final in cc/

cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc

Index: cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc
diff --git a/cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc b/cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc
index 4ffb0b27b4f201f3734f8403c5177855e548e1f3..3f01c54a174ce0bcfc5434de699b2ce1bf1c7b17 100644
--- a/cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc
+++ b/cc/animation/scrollbar_animation_controller_linear_fade_unittest.cc
@@ -22,14 +22,12 @@ class ScrollbarAnimationControllerLinearFadeTest
   ScrollbarAnimationControllerLinearFadeTest()
       : host_impl_(&proxy_, &shared_bitmap_manager_), needs_frame_count_(0) {}
 
-  virtual void PostDelayedScrollbarFade(const base::Closure& start_fade,
-                                        base::TimeDelta delay) override {
+  void PostDelayedScrollbarFade(const base::Closure& start_fade,
+                                base::TimeDelta delay) override {
     start_fade_ = start_fade;
     delay_ = delay;
   }
-  virtual void SetNeedsScrollbarAnimationFrame() override {
-    needs_frame_count_++;
-  }
+  void SetNeedsScrollbarAnimationFrame() override { needs_frame_count_++; }
 
  protected:
   virtual void SetUp() {
@@ -83,7 +81,7 @@ class ScrollbarAnimationControllerLinearFadeTest
 class VerticalScrollbarAnimationControllerLinearFadeTest
     : public ScrollbarAnimationControllerLinearFadeTest {
  protected:
-  virtual ScrollbarOrientation orientation() const override { return VERTICAL; }
+  ScrollbarOrientation orientation() const override { return VERTICAL; }
 };
 
 TEST_F(ScrollbarAnimationControllerLinearFadeTest, DelayAnimationOnResize) {