Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/graphics/IntRect.h

Index: Source/core/platform/graphics/IntRect.h
diff --git a/Source/core/platform/graphics/IntRect.h b/Source/core/platform/graphics/IntRect.h
index 22ea0d7be3167bbd37fa8354a44b770afab12fc0..a2e3492356f4ffcf5f7dd0f7e0987d4869a9fd9b 100644
--- a/Source/core/platform/graphics/IntRect.h
+++ b/Source/core/platform/graphics/IntRect.h
@@ -30,7 +30,7 @@
 #include "wtf/FastAllocBase.h"
 #include "wtf/Vector.h"
 
-#if OS(DARWIN)
+#if OS(MACOSX)
 typedef struct CGRect CGRect;
 
 #ifdef NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES
@@ -152,7 +152,7 @@ public:
 
     IntRect transposedRect() const { return IntRect(m_location.transposedPoint(), m_size.transposedSize()); }
 
-#if OS(DARWIN)
+#if OS(MACOSX)
     operator CGRect() const;
 #if !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
     operator NSRect() const;
@@ -193,7 +193,7 @@ inline bool operator!=(const IntRect& a, const IntRect& b)
     return a.location() != b.location() || a.size() != b.size();
 }
 
-#if OS(DARWIN)
+#if OS(MACOSX)
 IntRect enclosingIntRect(const CGRect&);
 #if !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
 IntRect enclosingIntRect(const NSRect&);