Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/graphics/FontCustomPlatformData.h

Index: Source/core/platform/graphics/FontCustomPlatformData.h
diff --git a/Source/core/platform/graphics/FontCustomPlatformData.h b/Source/core/platform/graphics/FontCustomPlatformData.h
index e7a2239b471760145ddf6f33b7bc6515b7247843..24d8b96d16d50c1ec83279096dc5da2bd41491ec 100644
--- a/Source/core/platform/graphics/FontCustomPlatformData.h
+++ b/Source/core/platform/graphics/FontCustomPlatformData.h
@@ -42,13 +42,13 @@
 #include <windows.h>
 #endif
 
-#if OS(DARWIN)
+#if OS(MACOSX)
 #include "wtf/RetainPtr.h"
 #include <CoreFoundation/CFBase.h>
 typedef struct CGFont* CGFontRef;
 #endif
 
-#if OS(DARWIN) || OS(UNIX) || (OS(WINDOWS) && !ENABLE(GDI_FONTS_ON_WINDOWS))
+#if OS(MACOSX) || OS(UNIX) || (OS(WINDOWS) && !ENABLE(GDI_FONTS_ON_WINDOWS))
 #include "wtf/RefPtr.h"
 class SkTypeface;
 #endif
@@ -73,7 +73,7 @@ private:
     FontCustomPlatformData(HANDLE fontReference, const String& name);
     HANDLE m_fontReference;
     String m_name;
-#elif OS(DARWIN)
+#elif OS(MACOSX)
     explicit FontCustomPlatformData(CGFontRef, PassRefPtr<SkTypeface>);
     RetainPtr<CGFontRef> m_cgFont;
     RefPtr<SkTypeface> m_typeface;