Rename OS(WINDOWS) to OS(WIN)

Source/core/platform/text/LineEnding.cpp

 /*
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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.
@@ skipping 202 matching lines @@
     normalizeToCROrLF(from, result, true);
 }
 
 void normalizeLineEndingsToLF(const CString& from, Vector<char>& result)
 {
     normalizeToCROrLF(from, result, false);
 }
 
 void normalizeLineEndingsToNative(const CString& from, Vector<char>& result)
 {
-#if OS(WINDOWS)
+#if OS(WIN)
     VectorCharAppendBuffer buffer(result);
     internalNormalizeLineEndingsToCRLF(from, buffer);
 #else
     normalizeLineEndingsToLF(from, result);
 #endif
 }
 
 } // namespace WebCore