Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/harfbuzz/HarfBuzzFaceCoreText.cpp

Index: Source/platform/fonts/harfbuzz/HarfBuzzFaceCoreText.cpp
diff --git a/Source/platform/fonts/harfbuzz/HarfBuzzFaceCoreText.cpp b/Source/platform/fonts/harfbuzz/HarfBuzzFaceCoreText.cpp
index 96b0285d4ec5b3a3300e6775111f86fca32c30e5..84d32f79f67aa6bac06571e8a5ef67309f202029 100644
--- a/Source/platform/fonts/harfbuzz/HarfBuzzFaceCoreText.cpp
+++ b/Source/platform/fonts/harfbuzz/HarfBuzzFaceCoreText.cpp
@@ -31,12 +31,12 @@
 #include "config.h"
 #include "platform/fonts/harfbuzz/HarfBuzzFace.h"
 
+#include "hb-coretext.h"
+#include "hb.h"
 #include "platform/fonts/FontPlatformData.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/fonts/harfbuzz/HarfBuzzShaper.h"
-
 #include <ApplicationServices/ApplicationServices.h>
-#include "hb.h"
 
 namespace WebCore {
 
@@ -100,31 +100,9 @@ static hb_font_funcs_t* harfBuzzCoreTextGetFontFuncs()
     return harfBuzzCoreTextFontFuncs;
 }
 
-static void releaseTableData(void* userData)
-{
-    CFDataRef cfData = reinterpret_cast<CFDataRef>(userData);
-    CFRelease(cfData);
-}
-
-static hb_blob_t* harfBuzzCoreTextGetTable(hb_face_t* face, hb_tag_t tag, void* userData)
-{
-    CGFontRef cgFont = reinterpret_cast<CGFontRef>(userData);
-    CFDataRef cfData = CGFontCopyTableForTag(cgFont, tag);
-    if (!cfData)
-        return 0;
-
-    const char* data = reinterpret_cast<const char*>(CFDataGetBytePtr(cfData));
-    const size_t length = CFDataGetLength(cfData);
-    if (!data || !length)
-        return 0;
-    return hb_blob_create(data, length, HB_MEMORY_MODE_READONLY, reinterpret_cast<void*>(const_cast<__CFData*>(cfData)), releaseTableData);
-}
-
 hb_face_t* HarfBuzzFace::createFace()
 {
-    // It seems that CTFontCopyTable of MacOSX10.5 sdk doesn't work for
-    // OpenType layout tables(GDEF, GSUB, GPOS). Use CGFontCopyTableForTag instead.
-    hb_face_t* face = hb_face_create_for_tables(harfBuzzCoreTextGetTable, m_platformData->cgFont(), 0);
+    hb_face_t* face = hb_coretext_face_create(m_platformData->cgFont());
     ASSERT(face);
     return face;
 }