Standardize usage of virtual/override/final in cc/

cc/layers/heads_up_display_unittest.cc

Index: cc/layers/heads_up_display_unittest.cc
diff --git a/cc/layers/heads_up_display_unittest.cc b/cc/layers/heads_up_display_unittest.cc
index 37d40a87078e9c813c31d775f5ff065e6bff8ada..312e482ff2db281c2ca06fc7733c402535ebe45b 100644
--- a/cc/layers/heads_up_display_unittest.cc
+++ b/cc/layers/heads_up_display_unittest.cc
@@ -12,7 +12,7 @@ namespace {
 
 class HeadsUpDisplayTest : public LayerTreeTest {
  protected:
-  virtual void InitializeSettings(LayerTreeSettings* settings) override {
+  void InitializeSettings(LayerTreeSettings* settings) override {
     // Enable the HUD without requiring text.
     settings->initial_debug_state.show_property_changed_rects = true;
   }
@@ -23,11 +23,11 @@ class DrawsContentLayer : public Layer {
   static scoped_refptr<DrawsContentLayer> Create() {
     return make_scoped_refptr(new DrawsContentLayer());
   }
-  virtual bool DrawsContent() const override { return true; }
+  bool DrawsContent() const override { return true; }
 
  private:
   DrawsContentLayer() : Layer() {}
-  virtual ~DrawsContentLayer() {}
+  ~DrawsContentLayer() override {}
 };
 
 class HudWithRootLayerChange : public HeadsUpDisplayTest {
@@ -37,14 +37,14 @@ class HudWithRootLayerChange : public HeadsUpDisplayTest {
         root_layer2_(DrawsContentLayer::Create()),
         num_commits_(0) {}
 
-  virtual void BeginTest() override {
+  void BeginTest() override {
     root_layer1_->SetBounds(gfx::Size(30, 30));
     root_layer2_->SetBounds(gfx::Size(30, 30));
 
     PostSetNeedsCommitToMainThread();
   }
 
-  virtual void DidCommit() override {
+  void DidCommit() override {
     ++num_commits_;
 
     ASSERT_TRUE(layer_tree_host()->hud_layer());
@@ -86,7 +86,7 @@ class HudWithRootLayerChange : public HeadsUpDisplayTest {
     }
   }
 
-  virtual void AfterTest() override {}
+  void AfterTest() override {}
 
  private:
   scoped_refptr<DrawsContentLayer> root_layer1_;