Standardize usage of virtual/override/final in cc/

cc/test/fake_content_layer_impl.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_FAKE_CONTENT_LAYER_IMPL_H_
 #define CC_TEST_FAKE_CONTENT_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/tiled_layer_impl.h"
 
 namespace cc {
 
 class FakeContentLayerImpl : public TiledLayerImpl {
  public:
   static scoped_ptr<FakeContentLayerImpl> Create(
       LayerTreeImpl* tree_impl, int id) {
     return make_scoped_ptr(new FakeContentLayerImpl(tree_impl, id));
   }
-  virtual ~FakeContentLayerImpl();
+  ~FakeContentLayerImpl() override;
 
-  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
-      override;
+  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
 
   bool HaveResourceForTileAt(int i, int j);
 
   size_t lost_output_surface_count() const {
     return lost_output_surface_count_;
   }
   void reset_lost_output_surface_count() { lost_output_surface_count_ = 0; }
 
-  virtual void ReleaseResources() override;
+  void ReleaseResources() override;
 
  private:
   explicit FakeContentLayerImpl(LayerTreeImpl* tree_impl, int id);
 
   size_t lost_output_surface_count_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_CONTENT_LAYER_IMPL_H_