Rename OS(WINDOWS) to OS(WIN)

Source/wtf/ThreadingWin.cpp

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 68 matching lines @@
  *
  *      You should have received a copy of the GNU Lesser General Public
  *      License along with this library in the file COPYING.LIB;
  *      if not, write to the Free Software Foundation, Inc.,
  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 
 #include "config.h"
 #include "Threading.h"
 
-#if OS(WINDOWS)
+#if OS(WIN)
 
 #include "wtf/CurrentTime.h"
 #include "wtf/DateMath.h"
 #include "wtf/HashMap.h"
 #include "wtf/MainThread.h"
 #include "wtf/MathExtras.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RandomNumberSeed.h"
 #include "wtf/ThreadFunctionInvocation.h"
@@ skipping 384 matching lines @@
 
     // Time is too far in the future (and would overflow unsigned long) - wait forever.
     if (absoluteTime - currentTime > static_cast<double>(INT_MAX) / 1000.0)
         return INFINITE;
 
     return static_cast<DWORD>((absoluteTime - currentTime) * 1000.0);
 }
 
 } // namespace WTF
 
-#endif // OS(WINDOWS)
+#endif // OS(WIN)