Standardize usage of virtual/override/final in content/renderer/

content/renderer/gpu/delegated_compositor_output_surface.h

 // Copyright 2013 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 CONTENT_RENDERER_GPU_DELEGATED_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_RENDERER_GPU_DELEGATED_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/renderer/gpu/compositor_output_surface.h"
 
 namespace content {
 class FrameSwapMessageQueue;
 
 class DelegatedCompositorOutputSurface : public CompositorOutputSurface {
  public:
   DelegatedCompositorOutputSurface(
       int32 routing_id,
       uint32 output_surface_id,
       const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
       scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue);
-  virtual ~DelegatedCompositorOutputSurface() {}
+  ~DelegatedCompositorOutputSurface() override {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_DELEGATED_COMPOSITOR_OUTPUT_SURFACE_H_