Standardize usage of virtual/override/final specifiers.

gpu/command_buffer/tests/occlusion_query_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 <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class OcclusionQueryTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     GLManager::Options options;
     options.size = gfx::Size(512, 512);
     gl_.Initialize(options);
   }
 
-  virtual void TearDown() {
-    gl_.Destroy();
-  }
+  void TearDown() override { gl_.Destroy(); }
 
   void DrawRect(float x, float z, float scale, float* color);
 
   GLManager gl_;
 
   GLint position_loc_;
   GLint matrix_loc_;
   GLint color_loc_;
 };
 
@@ skipping 106 matching lines @@
   glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_AVAILABLE_EXT, &result);
   EXPECT_TRUE(result);
   glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_EXT, &query_status);
   EXPECT_TRUE(query_status);
   GLTestHelper::CheckGLError("no errors", __LINE__);
 }
 
 }  // namespace gpu