Rename OS(DARWIN) to OS(MACOSX).

Source/core/platform/graphics/Font.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 233 matching lines @@
 #if ENABLE(SVG_FONTS)
     if (TextRun::RenderingContext* renderingContext = run.renderingContext())
         return renderingContext->floatWidthUsingSVGFont(*this, run, charsConsumed, glyphName);
 #endif
 
     charsConsumed = run.length();
     glyphName = "";
     return width(run);
 }
 
-#if !OS(DARWIN)
+#if !OS(MACOSX)
 
 PassOwnPtr<TextLayout> Font::createLayout(RenderText*, float, bool) const
 {
     return nullptr;
 }
 
 void Font::deleteLayout(TextLayout*)
 {
 }
 
@@ skipping 430 matching lines @@
 }
 
 void Font::willUseFontData() const
 {
     const FontFamily& family = fontDescription().family();
     if (m_fontFallbackList && m_fontFallbackList->fontSelector() && !family.familyIsEmpty())
         m_fontFallbackList->fontSelector()->willUseFontData(fontDescription(), family.family());
 }
 
 }