Standardize usage of virtual/override/final specifiers.

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 145 matching lines @@
 
     // Now it should be available
     gl_fake_queries_.SetCurrentGLTime(end_timestamp);
     EXPECT_TRUE(trace->IsAvailable());
 
     // Proces should output expected Trace results to MockOutputter
     trace->Process();
   }
 
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     GpuServiceTest::SetUp();
     gl_fake_queries_.Reset();
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     gl_.reset();
     gl_fake_queries_.Reset();
     GpuServiceTest::TearDown();
   }
 
   virtual void SetupTimerQueryMocks() {
     // Delegate query APIs used by GPUTrace to a GlFakeQueries
     EXPECT_CALL(*gl_, GenQueriesARB(_, NotNull())).Times(AtLeast(1)).WillOnce(
         Invoke(&gl_fake_queries_, &GlFakeQueries::GenQueriesARB));
 
@@ skipping 42 matching lines @@
 
 TEST_F(GpuDisjointTimerTracerTest, GPUTrace) {
   // Test basic timer query functionality
   {
     DoTraceTest();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu