Standardize usage of virtual/override/final in cc/

cc/test/layer_tree_pixel_test.h

Index: cc/test/layer_tree_pixel_test.h
diff --git a/cc/test/layer_tree_pixel_test.h b/cc/test/layer_tree_pixel_test.h
index eae283ba66e3d51dd21fd636271cd4f91a9c9094..5c220d59cb810a43c9a488109570b9e804a33336 100644
--- a/cc/test/layer_tree_pixel_test.h
+++ b/cc/test/layer_tree_pixel_test.h
@@ -34,17 +34,17 @@ class LayerTreePixelTest : public LayerTreeTest {
   LayerTreePixelTest();
   virtual ~LayerTreePixelTest();
 
-  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) override;
-  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) override;
+  scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) override;
+  void CommitCompleteOnThread(LayerTreeHostImpl* impl) override;
 
   virtual scoped_ptr<CopyOutputRequest> CreateCopyOutputRequest();
 
   void ReadbackResult(scoped_ptr<CopyOutputResult> result);
 
-  virtual void BeginTest() override;
-  virtual void SetupTree() override;
-  virtual void AfterTest() override;
-  virtual void EndTest() override;
+  void BeginTest() override;
+  void SetupTree() override;
+  void AfterTest() override;
+  void EndTest() override;
 
   void TryEndTest();