Standardize usage of virtual/override/final in gpu/

gpu/command_buffer/service/gpu_tracer_unittest.cc

 // Copyright 2014 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 <map>
 #include <set>
 
 #include "gpu/command_buffer/service/gpu_service_test.h"
 #include "gpu/command_buffer/service/gpu_tracer.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 189 matching lines @@
              Invoke(&gl_fake_queries_, &GlFakeQueries::DeleteQueriesARB));
   }
 
   virtual GpuTracerType GetTracerType() = 0;
 
   GlFakeQueries gl_fake_queries_;
 };
 
 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) {
   // Test basic timer query functionality
   {
     DoTraceTest();
   }
 }
 
 TEST_F(GpuDisjointTimerTracerTest, GPUTrace) {
   // Test basic timer query functionality
   {
     DoTraceTest();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu