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

content/browser/gpu/gpu_memory_buffer_factory_host_impl.h

 // Copyright (c) 2014 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_BROWSER_GPU_GPU_MEMORY_BUFFER_FACTORY_HOST_IMPL_H_
 #define CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_FACTORY_HOST_IMPL_H_
 
 #include <map>
 
 #include "content/common/gpu/client/gpu_memory_buffer_factory_host.h"
 
 namespace content {
 
 class CONTENT_EXPORT GpuMemoryBufferFactoryHostImpl
     : public GpuMemoryBufferFactoryHost {
  public:
   GpuMemoryBufferFactoryHostImpl();
-  virtual ~GpuMemoryBufferFactoryHostImpl();
+  ~GpuMemoryBufferFactoryHostImpl() override;
 
   // Overridden from GpuMemoryBufferFactoryHost:
-  virtual void CreateGpuMemoryBuffer(
+  void CreateGpuMemoryBuffer(
       const gfx::GpuMemoryBufferHandle& handle,
       const gfx::Size& size,
       gfx::GpuMemoryBuffer::Format format,
       gfx::GpuMemoryBuffer::Usage usage,
       const CreateGpuMemoryBufferCallback& callback) override;
-  virtual void DestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
-                                      int32 sync_point) override;
+  void DestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
+                              int32 sync_point) override;
 
   void set_gpu_host_id(int gpu_host_id) { gpu_host_id_ = gpu_host_id; }
 
  private:
   void OnGpuMemoryBufferCreated(uint32 request_id,
                                 const gfx::GpuMemoryBufferHandle& handle);
 
   int gpu_host_id_;
   uint32 next_create_gpu_memory_buffer_request_id_;
   typedef std::map<uint32, CreateGpuMemoryBufferCallback>
       CreateGpuMemoryBufferCallbackMap;
   CreateGpuMemoryBufferCallbackMap create_gpu_memory_buffer_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferFactoryHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_FACTORY_HOST_IMPL_H_