Rename OS(WINDOWS) to OS(WIN)

Source/core/platform/audio/DenormalDisabler.h

Index: Source/core/platform/audio/DenormalDisabler.h
diff --git a/Source/core/platform/audio/DenormalDisabler.h b/Source/core/platform/audio/DenormalDisabler.h
index 64b0d5e1dfae9cff58a7e18484498395ecbed4b9..bbceadacba94cbe5736f5a80d0726d5e1e11bb4f 100644
--- a/Source/core/platform/audio/DenormalDisabler.h
+++ b/Source/core/platform/audio/DenormalDisabler.h
@@ -33,7 +33,7 @@ namespace WebCore {
 // Deal with denormals. They can very seriously impact performance on x86.
 
 // Define HAVE_DENORMAL if we support flushing denormals to zero.
-#if OS(WINDOWS) && COMPILER(MSVC)
+#if OS(WIN) && COMPILER(MSVC)
 #define HAVE_DENORMAL
 #endif
 
@@ -47,7 +47,7 @@ public:
     DenormalDisabler()
             : m_savedCSR(0)
     {
-#if OS(WINDOWS) && COMPILER(MSVC)
+#if OS(WIN) && COMPILER(MSVC)
         // Save the current state, and set mode to flush denormals.
         //
         // http://stackoverflow.com/questions/637175/possible-bug-in-controlfp-s-may-not-restore-control-word-correctly
@@ -62,7 +62,7 @@ public:
 
     ~DenormalDisabler()
     {
-#if OS(WINDOWS) && COMPILER(MSVC)
+#if OS(WIN) && COMPILER(MSVC)
         unsigned int unused;
         _controlfp_s(&unused, m_savedCSR, _MCW_DN);
 #else
@@ -73,7 +73,7 @@ public:
     // This is a nop if we can flush denormals to zero in hardware.
     static inline float flushDenormalFloatToZero(float f)
     {
-#if OS(WINDOWS) && COMPILER(MSVC) && (!_M_IX86_FP)
+#if OS(WIN) && COMPILER(MSVC) && (!_M_IX86_FP)
         // For systems using x87 instead of sse, there's no hardware support
         // to flush denormals automatically. Hence, we need to flush
         // denormals to zero manually.