Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/skia/SimpleFontDataSkia.cpp

 /*
  * Copyright (c) 2008, 2009, 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 27 matching lines @@
 #include "SkTypes.h"
 #include "SkUtils.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/GlyphPage.h"
 #include "platform/fonts/VDMXParser.h"
 #include "platform/geometry/FloatRect.h"
 #include "wtf/unicode/Unicode.h"
 
 namespace blink {
 
+#if OS(LINUX) || OS(ANDROID)
 // This is the largest VDMX table which we'll try to load and parse.
 static const size_t maxVDMXTableSize = 1024 * 1024; // 1 MB
+#endif
 
 void SimpleFontData::platformInit()
 {
     if (!m_platformData.size()) {
         m_fontMetrics.reset();
         m_avgCharWidth = 0;
         m_maxCharWidth = 0;
         return;
     }
 
@@ skipping 236 matching lines @@
         if (glyphs[i]) {
             pageToFill->setGlyphDataForIndex(offset + i, glyphs[i], this);
             haveGlyphs = true;
         }
     }
 
     return haveGlyphs;
 }
 
 } // namespace blink