Standardize usage of virtual/override/final in content/

content/child/child_gpu_memory_buffer_manager.h

 // Copyright 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_CHILD_CHILD_GPU_MEMORY_BUFFER_MANAGER_H_
 #define CONTENT_CHILD_CHILD_GPU_MEMORY_BUFFER_MANAGER_H_
 
 #include "cc/resources/gpu_memory_buffer_manager.h"
 #include "content/child/thread_safe_sender.h"
 
 namespace content {
 
 class ChildGpuMemoryBufferManager : public cc::GpuMemoryBufferManager {
  public:
   ChildGpuMemoryBufferManager(ThreadSafeSender* sender);
-  virtual ~ChildGpuMemoryBufferManager();
+  ~ChildGpuMemoryBufferManager() override;
 
   // Overridden from cc::GpuMemoryBufferManager:
-  virtual scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
+  scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
       const gfx::Size& size,
       gfx::GpuMemoryBuffer::Format format,
       gfx::GpuMemoryBuffer::Usage usage) override;
-  virtual gfx::GpuMemoryBuffer* GpuMemoryBufferFromClientBuffer(
+  gfx::GpuMemoryBuffer* GpuMemoryBufferFromClientBuffer(
       ClientBuffer buffer) override;
 
  private:
   scoped_refptr<ThreadSafeSender> sender_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildGpuMemoryBufferManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_GPU_MEMORY_BUFFER_MANAGER_H_