Update {virtual,override} to follow C++11 style in gpu.

gpu/command_buffer/client/client_test_helper.h

 // Copyright (c) 2012 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.
 
 // Helper classes for implementing gpu client side unit tests.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_CLIENT_TEST_HELPER_H_
 #define GPU_COMMAND_BUFFER_CLIENT_CLIENT_TEST_HELPER_H_
 
 #include "base/compiler_specific.h"
@@ skipping 45 matching lines @@
   scoped_refptr<Buffer> transfer_buffer_buffers_[kMaxTransferBuffers];
   CommandBufferEntry* ring_buffer_;
   scoped_refptr<Buffer> ring_buffer_buffer_;
   State state_;
   int32 put_offset_;
 };
 
 class MockClientCommandBuffer : public MockCommandBufferBase {
  public:
   MockClientCommandBuffer();
-  virtual ~MockClientCommandBuffer();
+  ~MockClientCommandBuffer() override;
 
   // This is so we can use all the gmock functions when Flush is called.
   MOCK_METHOD0(OnFlush, void());
   MOCK_METHOD1(DestroyTransferBuffer, void(int32 id));
 
-  virtual void Flush(int32 put_offset) override;
-  virtual void OrderingBarrier(int32 put_offset) override;
+  void Flush(int32 put_offset) override;
+  void OrderingBarrier(int32 put_offset) override;
 
   void DelegateToFake();
 };
 
 class MockClientCommandBufferMockFlush : public MockClientCommandBuffer {
  public:
   MockClientCommandBufferMockFlush();
   virtual ~MockClientCommandBufferMockFlush();
 
   MOCK_METHOD1(Flush, void(int32 put_offset));
@@ skipping 29 matching lines @@
   MOCK_METHOD1(SetLock, void(base::Lock*));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockClientGpuControl);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_CLIENT_TEST_HELPER_H_