Standardize usage of virtual/override/final in cc/

cc/layers/contents_scaling_layer_unittest.cc

 // 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.
 
 #include "cc/layers/contents_scaling_layer.h"
 
 #include <vector>
 
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/geometry_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 class MockContentsScalingLayer : public ContentsScalingLayer {
  public:
   MockContentsScalingLayer()
       : ContentsScalingLayer() {}
 
-  virtual void SetNeedsDisplayRect(const gfx::Rect& dirty_rect) override {
+  void SetNeedsDisplayRect(const gfx::Rect& dirty_rect) override {
     last_needs_display_rect_ = dirty_rect;
     ContentsScalingLayer::SetNeedsDisplayRect(dirty_rect);
   }
 
   const gfx::Rect& LastNeedsDisplayRect() const {
     return last_needs_display_rect_;
   }
 
  private:
-  virtual ~MockContentsScalingLayer() {}
+  ~MockContentsScalingLayer() override {}
 
   gfx::Rect last_needs_display_rect_;
 };
 
 static void CalcDrawProps(FakeLayerTreeHost* host, float device_scale_factor) {
   RenderSurfaceLayerList render_surface_layer_list;
   LayerTreeHostCommon::CalcDrawPropsMainInputsForTesting inputs(
       host->root_layer(), gfx::Size(500, 500), &render_surface_layer_list);
   inputs.device_scale_factor = device_scale_factor;
   LayerTreeHostCommon::CalculateDrawProperties(&inputs);
@@ skipping 27 matching lines @@
   EXPECT_EQ(20, test_layer->content_bounds().width());
   EXPECT_EQ(40, test_layer->content_bounds().height());
 
   CalcDrawProps(host.get(), 1.33f);
   EXPECT_EQ(14, test_layer->content_bounds().width());
   EXPECT_EQ(27, test_layer->content_bounds().height());
 }
 
 }  // namespace
 }  // namespace cc