Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/graphics/mac/FontMac.cpp

 /*
  * Copyright (c) 2011 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 54 matching lines @@
     paint->setVerticalText(platformData.orientation() == Vertical);
     SkTypeface* typeface = SkCreateTypefaceFromCTFont(platformData.ctFont());
     SkAutoUnref autoUnref(typeface);
     paint->setTypeface(typeface);
     paint->setFakeBoldText(platformData.m_syntheticBold);
     paint->setTextSkewX(platformData.m_syntheticOblique ? -SK_Scalar1 / 4 : 0);
     paint->setAutohinted(false); // freetype specific
     paint->setLCDRenderText(shouldSmoothFonts);
     paint->setSubpixelText(true);
 
-#if OS(DARWIN)
+#if OS(MACOSX)
     // When using CoreGraphics, disable hinting when webkit-font-smoothing:antialiased is used.
     // See crbug.com/152304
     if (font->fontDescription().fontSmoothing() == Antialiased)
         paint->setHinting(SkPaint::kNo_Hinting);
 #endif
 
     if (font->fontDescription().textRenderingMode() == GeometricPrecision)
         paint->setHinting(SkPaint::kNo_Hinting);
 }
 
@@ skipping 87 matching lines @@
             paint.setLooper(0);
         }
 
         gc->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, textRect, paint);
     }
     if (font->platformData().orientation() == Vertical)
         gc->restore();
 }
 
 } // namespace WebCore