Standardize usage of virtual/override/final in gpu/

gpu/command_buffer/service/gpu_scheduler.h

Index: gpu/command_buffer/service/gpu_scheduler.h
diff --git a/gpu/command_buffer/service/gpu_scheduler.h b/gpu/command_buffer/service/gpu_scheduler.h
index fed0ce41783ec3fba62929bde7a098f49d83f86a..5e47d4a316b16383f88c784c52c05ed8be628f95 100644
--- a/gpu/command_buffer/service/gpu_scheduler.h
+++ b/gpu/command_buffer/service/gpu_scheduler.h
@@ -56,7 +56,7 @@ class GPU_EXPORT GpuScheduler
                AsyncAPIInterface* handler,
                gles2::GLES2Decoder* decoder);
 
-  virtual ~GpuScheduler();
+  ~GpuScheduler() override;
 
   void PutChanged();
 
@@ -83,11 +83,11 @@ class GPU_EXPORT GpuScheduler
   void SetSchedulingChangedCallback(const SchedulingChangedCallback& callback);
 
   // Implementation of CommandBufferEngine.
-  virtual scoped_refptr<Buffer> GetSharedMemoryBuffer(int32 shm_id) override;
-  virtual void set_token(int32 token) override;
-  virtual bool SetGetBuffer(int32 transfer_buffer_id) override;
-  virtual bool SetGetOffset(int32 offset) override;
-  virtual int32 GetGetOffset() override;
+  scoped_refptr<Buffer> GetSharedMemoryBuffer(int32 shm_id) override;
+  void set_token(int32 token) override;
+  bool SetGetBuffer(int32 transfer_buffer_id) override;
+  bool SetGetOffset(int32 offset) override;
+  int32 GetGetOffset() override;
 
   void SetCommandProcessedCallback(const base::Closure& callback);