Standardize usage of virtual/override/final specifiers.

gpu/config/gpu_driver_bug_list_unittest.cc

Index: gpu/config/gpu_driver_bug_list_unittest.cc
diff --git a/gpu/config/gpu_driver_bug_list_unittest.cc b/gpu/config/gpu_driver_bug_list_unittest.cc
index e927e6c2c785b11fef1efb58bd8c2cd0c5e196f5..33e09a14bd99ce11260ee17490d3b560f5b47791 100644
--- a/gpu/config/gpu_driver_bug_list_unittest.cc
+++ b/gpu/config/gpu_driver_bug_list_unittest.cc
@@ -19,14 +19,14 @@ class GpuDriverBugListTest : public testing::Test {
  public:
   GpuDriverBugListTest() { }
 
-  virtual ~GpuDriverBugListTest() { }
+  ~GpuDriverBugListTest() override {}
 
   const GPUInfo& gpu_info() const {
     return gpu_info_;
   }
 
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     gpu_info_.gpu.vendor_id = 0x10de;
     gpu_info_.gpu.device_id = 0x0640;
     gpu_info_.driver_vendor = "NVIDIA";
@@ -41,8 +41,7 @@ class GpuDriverBugListTest : public testing::Test {
     gpu_info_.performance_stats.overall = 5.0;
   }
 
-  virtual void TearDown() {
-  }
+  void TearDown() override {}
 
  private:
   GPUInfo gpu_info_;