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

content/browser/gpu/gpu_memory_buffer_factory_host_impl.h

Index: content/browser/gpu/gpu_memory_buffer_factory_host_impl.h
diff --git a/content/browser/gpu/gpu_memory_buffer_factory_host_impl.h b/content/browser/gpu/gpu_memory_buffer_factory_host_impl.h
index f8bf42c5782468caec8f47f6031be9d653180ddd..e425b948f5dcda2dc96cb251123355164525c0c3 100644
--- a/content/browser/gpu/gpu_memory_buffer_factory_host_impl.h
+++ b/content/browser/gpu/gpu_memory_buffer_factory_host_impl.h
@@ -15,17 +15,17 @@ 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; }