Remove dead code guarded by OS(WINDOWS) && USE(PTHREADS).

Source/wtf/ThreadSpecificWin.cpp

 /*
  * Copyright (C) 2009 Jian Li <jianli@chromium.org>
  * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 10 matching lines @@
 
 #include "config.h"
 #include "ThreadSpecific.h"
 
 #if OS(WINDOWS)
 
 #include "StdLibExtras.h"
 #include "ThreadingPrimitives.h"
 #include "wtf/DoublyLinkedList.h"
 
-#if !USE(PTHREADS)
-
 namespace WTF {
 
 static DoublyLinkedList<PlatformThreadSpecificKey>& destructorsList()
 {
     DEFINE_STATIC_LOCAL(DoublyLinkedList<PlatformThreadSpecificKey>, staticList, ());
     return staticList;
 }
 
 static Mutex& destructorsMutex()
 {
@@ skipping 84 matching lines @@
     PlatformThreadSpecificKey* key = destructorsList().head();
     while (key) {
         PlatformThreadSpecificKey* nextKey = key->next();
         key->callDestructor();
         key = nextKey;
     }
 }
 
 } // namespace WTF
 
-#endif // !USE(PTHREADS)
-
 #endif // OS(WINDOWS)