Standardize usage of virtual/override/final in cc/

cc/surfaces/surface_aggregator_unittest.cc

Index: cc/surfaces/surface_aggregator_unittest.cc
diff --git a/cc/surfaces/surface_aggregator_unittest.cc b/cc/surfaces/surface_aggregator_unittest.cc
index 243a9a43e69ed676fa882b50ed1345201e41c40c..ef369f407d92afbf314876aba2fb093950145a49 100644
--- a/cc/surfaces/surface_aggregator_unittest.cc
+++ b/cc/surfaces/surface_aggregator_unittest.cc
@@ -42,8 +42,7 @@ gfx::Size SurfaceSize() {
 
 class EmptySurfaceFactoryClient : public SurfaceFactoryClient {
  public:
-  virtual void ReturnResources(
-      const ReturnedResourceArray& resources) override {}
+  void ReturnResources(const ReturnedResourceArray& resources) override {}
 };
 
 class SurfaceAggregatorTest : public testing::Test {
@@ -1147,10 +1146,9 @@ class SurfaceAggregatorWithResourcesTest : public testing::Test {
 class ResourceTrackingSurfaceFactoryClient : public SurfaceFactoryClient {
  public:
   ResourceTrackingSurfaceFactoryClient() {}
-  virtual ~ResourceTrackingSurfaceFactoryClient() {}
+  ~ResourceTrackingSurfaceFactoryClient() override {}
 
-  virtual void ReturnResources(
-      const ReturnedResourceArray& resources) override {
+  void ReturnResources(const ReturnedResourceArray& resources) override {
     returned_resources_ = resources;
   }