Standardize usage of virtual/override/final in cc/

cc/test/fake_content_layer.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/test/fake_content_layer.h"
 
 #include "cc/resources/content_layer_updater.h"
 #include "cc/resources/prioritized_resource.h"
 #include "cc/test/fake_content_layer_impl.h"
 
 namespace cc {
 
 class FakeContentLayerUpdater : public ContentLayerUpdater {
  public:
   using ContentLayerUpdater::paint_rect;
 
  private:
-  virtual ~FakeContentLayerUpdater() {}
+  ~FakeContentLayerUpdater() override {}
 };
 
 FakeContentLayer::FakeContentLayer(ContentLayerClient* client)
     : ContentLayer(client),
       update_count_(0),
       push_properties_count_(0),
       output_surface_created_count_(0),
       always_update_resources_(false) {
   SetBounds(gfx::Size(1, 1));
   SetIsDrawable(true);
@@ skipping 26 matching lines @@
   ContentLayer::OnOutputSurfaceCreated();
   output_surface_created_count_++;
 }
 
 bool FakeContentLayer::HaveBackingAt(int i, int j) {
   const PrioritizedResource* resource = ResourceAtForTesting(i, j);
   return resource && resource->have_backing_texture();
 }
 
 }  // namespace cc