Standardize usage of virtual/override/final in gpu/

gpu/command_buffer/service/gpu_tracer_unittest.cc

Index: gpu/command_buffer/service/gpu_tracer_unittest.cc
diff --git a/gpu/command_buffer/service/gpu_tracer_unittest.cc b/gpu/command_buffer/service/gpu_tracer_unittest.cc
index 6be4d5b5fe716de65d9d4821decc7472086b5009..fe353c3f1670c7b5e06421ee68c484ae961777f6 100644
--- a/gpu/command_buffer/service/gpu_tracer_unittest.cc
+++ b/gpu/command_buffer/service/gpu_tracer_unittest.cc
@@ -207,16 +207,12 @@ class BaseGpuTracerTest : public GpuServiceTest {
 
 class GpuARBTimerTracerTest : public BaseGpuTracerTest {
  protected:
-  virtual GpuTracerType GetTracerType() override {
-    return kTracerTypeARBTimer;
-  }
+  GpuTracerType GetTracerType() override { return kTracerTypeARBTimer; }
 };
 
 class GpuDisjointTimerTracerTest : public BaseGpuTracerTest {
  protected:
-  virtual GpuTracerType GetTracerType() override {
-    return kTracerTypeDisjointTimer;
-  }
+  GpuTracerType GetTracerType() override { return kTracerTypeDisjointTimer; }
 };
 
 TEST_F(GpuARBTimerTracerTest, GPUTrace) {