Standardize usage of virtual/override/final in cc/

cc/input/top_controls_manager_unittest.cc

Index: cc/input/top_controls_manager_unittest.cc
diff --git a/cc/input/top_controls_manager_unittest.cc b/cc/input/top_controls_manager_unittest.cc
index 177904c29c10096034979b7c14c380915c0f0887..9bde132ce23dca414517560b1c5bccd5af3a3b40 100644
--- a/cc/input/top_controls_manager_unittest.cc
+++ b/cc/input/top_controls_manager_unittest.cc
@@ -35,24 +35,20 @@ class MockTopControlsManagerClient : public TopControlsManagerClient {
     root_scroll_layer_ = LayerImpl::Create(active_tree_.get(), 1);
   }
 
-  virtual ~MockTopControlsManagerClient() {}
+  ~MockTopControlsManagerClient() override {}
 
-  virtual void DidChangeTopControlsPosition() override {
+  void DidChangeTopControlsPosition() override {
     redraw_needed_ = true;
     update_draw_properties_needed_ = true;
   }
 
-  virtual bool HaveRootScrollLayer() const override {
-    return true;
-  }
+  bool HaveRootScrollLayer() const override { return true; }
 
-  virtual void SetControlsTopOffset(float offset) override {
+  void SetControlsTopOffset(float offset) override {
     top_controls_top_offset_ = offset;
   }
 
-  virtual float ControlsTopOffset() const override {
-    return top_controls_top_offset_;
-  }
+  float ControlsTopOffset() const override { return top_controls_top_offset_; }
 
   LayerImpl* rootScrollLayer() {
     return root_scroll_layer_.get();