Standardize usage of virtual/override/final specifiers.

gpu/config/gpu_test_config_unittest.cc

 // 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.
 
 #include "gpu/config/gpu_info.h"
 #include "gpu/config/gpu_test_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class GPUTestConfigTest : public testing::Test {
  public:
   GPUTestConfigTest() { }
 
-  virtual ~GPUTestConfigTest() { }
+  ~GPUTestConfigTest() override {}
 
  protected:
-  virtual void SetUp() { }
+  void SetUp() override {}
 
-  virtual void TearDown() { }
+  void TearDown() override {}
 };
 
 TEST_F(GPUTestConfigTest, EmptyValues) {
   GPUTestConfig config;
   EXPECT_EQ(GPUTestConfig::kOsUnknown, config.os());
   EXPECT_EQ(0u, config.gpu_vendor().size());
   EXPECT_EQ(0u, config.gpu_device_id());
   EXPECT_EQ(GPUTestConfig::kBuildTypeUnknown, config.build_type());
 }
 
@@ skipping 215 matching lines @@
   GPUTestBotConfig config;
   GPUInfo gpu_info;
   gpu_info.gpu.vendor_id = 0x10de;
   gpu_info.gpu.device_id = 0x0640;
   EXPECT_TRUE(config.LoadCurrentConfig(&gpu_info));
   EXPECT_TRUE(config.IsValid());
 }
 
 }  // namespace gpu