Make the windows_version.h functions threadsafe by using a singleton. Add accessors to the singl...

sandbox/tests/unit_tests/unit_tests.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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 "base/at_exit.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 int wmain(int argc, wchar_t **argv) {
+  // The exit manager is in charge of calling the dtors of singleton objects.
+  base::AtExitManager exit_manager;
+
   if (argc >= 2) {
     if (0 == _wcsicmp(argv[1], L"-child"))
       // This instance is a child, not the test.
       return 0;
   }
 
   testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }