Standardize usage of virtual/override/final specifiers.

gpu/config/gpu_test_config_unittest.cc

Index: gpu/config/gpu_test_config_unittest.cc
diff --git a/gpu/config/gpu_test_config_unittest.cc b/gpu/config/gpu_test_config_unittest.cc
index b9411dc52ad37b1f69ac2f83a694780cf951693b..40188f35aefe18e11ed3caebd711fceb2e864dba 100644
--- a/gpu/config/gpu_test_config_unittest.cc
+++ b/gpu/config/gpu_test_config_unittest.cc
@@ -12,12 +12,12 @@ 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) {