Standardize usage of virtual/override/final in cc/

cc/trees/layer_tree_host_unittest_video.cc

Index: cc/trees/layer_tree_host_unittest_video.cc
diff --git a/cc/trees/layer_tree_host_unittest_video.cc b/cc/trees/layer_tree_host_unittest_video.cc
index 8d8b13071d52b15415e183ebabd8251c4a3a1aa4..ffeda727fe3f30fc38280a8f78b161fcb6918ceb 100644
--- a/cc/trees/layer_tree_host_unittest_video.cc
+++ b/cc/trees/layer_tree_host_unittest_video.cc
@@ -22,7 +22,7 @@ class LayerTreeHostVideoTest : public LayerTreeTest {};
 class LayerTreeHostVideoTestSetNeedsDisplay
     : public LayerTreeHostVideoTest {
  public:
-  virtual void SetupTree() override {
+  void SetupTree() override {
     scoped_refptr<Layer> root = Layer::Create();
     root->SetBounds(gfx::Size(10, 10));
     root->SetIsDrawable(true);
@@ -39,14 +39,14 @@ class LayerTreeHostVideoTestSetNeedsDisplay
     LayerTreeHostVideoTest::SetupTree();
   }
 
-  virtual void BeginTest() override {
+  void BeginTest() override {
     num_draws_ = 0;
     PostSetNeedsCommitToMainThread();
   }
 
-  virtual DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
-                                           LayerTreeHostImpl::FrameData* frame,
-                                           DrawResult draw_result) override {
+  DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
+                                   LayerTreeHostImpl::FrameData* frame,
+                                   DrawResult draw_result) override {
     LayerImpl* root_layer = host_impl->active_tree()->root_layer();
     RenderSurfaceImpl* root_surface = root_layer->render_surface();
     gfx::RectF damage_rect =
@@ -70,7 +70,7 @@ class LayerTreeHostVideoTestSetNeedsDisplay
     return draw_result;
   }
 
-  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) override {
+  void DrawLayersOnThread(LayerTreeHostImpl* host_impl) override {
     VideoLayerImpl* video = static_cast<VideoLayerImpl*>(
         host_impl->active_tree()->root_layer()->children()[0]);
 
@@ -82,9 +82,7 @@ class LayerTreeHostVideoTestSetNeedsDisplay
     ++num_draws_;
   }
 
-  virtual void AfterTest() override {
-    EXPECT_EQ(2, num_draws_);
-  }
+  void AfterTest() override { EXPECT_EQ(2, num_draws_); }
 
  private:
   int num_draws_;