Rename OS(WINDOWS) to OS(WIN)

Source/wtf/PageAllocator.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
 #include <sys/mman.h>
 
 #ifndef MADV_FREE
 #define MADV_FREE MADV_DONTNEED
 #endif
 
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 
-#elif OS(WINDOWS)
+#elif OS(WIN)
 
 #include <windows.h>
 
 #else
 #error Unknown OS
 #endif // OS(UNIX)
 
 namespace WTF {
 
 void* allocSuperPages(void* addr, size_t len)
@@ skipping 78 matching lines @@
 
 char* getRandomSuperPageBase()
 {
     uintptr_t random;
     random = static_cast<uintptr_t>(cryptographicallyRandomNumber());
 #if CPU(X86_64)
     random <<= 32UL;
     random |= static_cast<uintptr_t>(cryptographicallyRandomNumber());
     // This address mask gives a low liklihood of address space collisions.
     // We handle the situation gracefully if there is a collision.
-#if OS(WINDOWS)
+#if OS(WIN)
     // 64-bit Windows has a bizarrely small 8TB user address space.
     // Allocates in the 1-5TB region.
     random &= (0x3ffffffffffUL & kSuperPageBaseMask);
     random += 0x10000000000UL;
 #else
     random &= (0x3fffffffffffUL & kSuperPageBaseMask);
 #endif
 #else // !CPU(X86_64)
     // This is a good range on Windows, Linux and Mac.
     // Allocates in the 0.5-1.5GB region.
     random &= (0x3fffffff & kSuperPageBaseMask);
     random += 0x20000000;
 #endif // CPU(X86_64)
     return reinterpret_cast<char*>(random);
 }
 
 } // namespace WTF