Standardize usage of virtual/override/final in content/

content/gpu/in_process_gpu_thread.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_GPU_IN_PROCESS_GPU_THREAD_H_
 #define CONTENT_GPU_IN_PROCESS_GPU_THREAD_H_
 
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class GpuProcess;
 
 // This class creates a GPU thread (instead of a GPU process), when running
 // with --in-process-gpu or --single-process.
 class InProcessGpuThread : public base::Thread {
  public:
   explicit InProcessGpuThread(const std::string& channel_id);
-  virtual ~InProcessGpuThread();
+  ~InProcessGpuThread() override;
 
  protected:
-  virtual void Init() override;
-  virtual void CleanUp() override;
+  void Init() override;
+  void CleanUp() override;
 
  private:
   std::string channel_id_;
   // Deleted in CleanUp() on the gpu thread, so don't use smart pointers.
   GpuProcess* gpu_process_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessGpuThread);
 };
 
 CONTENT_EXPORT base::Thread* CreateInProcessGpuThread(
     const std::string& channel_id);
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_IN_PROCESS_GPU_THREAD_H_