Standardize usage of virtual/override/final in cc/

cc/surfaces/surface_factory_unittest.cc

Index: cc/surfaces/surface_factory_unittest.cc
diff --git a/cc/surfaces/surface_factory_unittest.cc b/cc/surfaces/surface_factory_unittest.cc
index ba2a8884f9b5b52dfe1ec499f345101e41858058..636a5ffab3743ee3ecf77582a56d4ed60a7a93fb 100644
--- a/cc/surfaces/surface_factory_unittest.cc
+++ b/cc/surfaces/surface_factory_unittest.cc
@@ -17,10 +17,9 @@ namespace {
 class TestSurfaceFactoryClient : public SurfaceFactoryClient {
  public:
   TestSurfaceFactoryClient() {}
-  virtual ~TestSurfaceFactoryClient() {}
+  ~TestSurfaceFactoryClient() override {}
 
-  virtual void ReturnResources(
-      const ReturnedResourceArray& resources) override {
+  void ReturnResources(const ReturnedResourceArray& resources) override {
     returned_resources_.insert(
         returned_resources_.end(), resources.begin(), resources.end());
   }