Standardize usage of virtual/override/final specifiers.

gpu/config/gpu_control_list_os_info_unittest.cc

 // Copyright (c) 2013 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 "gpu/config/gpu_control_list.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class OsInfoTest : public testing::Test {
  public:
   OsInfoTest() { }
-  virtual ~OsInfoTest() { }
+  ~OsInfoTest() override {}
 
   typedef GpuControlList::OsInfo OsInfo;
 };
 
 TEST_F(OsInfoTest, ValidOsInfo) {
   const std::string os[] = {
     "win",
     "linux",
     "macosx",
     "chromeos",
@@ skipping 118 matching lines @@
     EXPECT_FALSE(info.Contains(GpuControlList::kOsWin, std::string()));
     EXPECT_TRUE(info.Contains(GpuControlList::kOsWin, "6"));
     EXPECT_TRUE(info.Contains(GpuControlList::kOsWin, "6.1"));
     EXPECT_TRUE(info.Contains(GpuControlList::kOsWin, "7"));
     EXPECT_FALSE(info.Contains(GpuControlList::kOsWin, "5"));
   }
 }
 
 }  // namespace gpu