Switch to HarfBuzz on Mac and remove CoreText shaper

Source/platform/fonts/cocoa/FontPlatformDataCocoa.mm

Index: Source/platform/fonts/cocoa/FontPlatformDataCocoa.mm
diff --git a/Source/platform/fonts/cocoa/FontPlatformDataCocoa.mm b/Source/platform/fonts/cocoa/FontPlatformDataCocoa.mm
index 9f3bd9fc9599faedf78e3e3384b2c116163ba6be..de9069b35905ef4f51ad9edc580d7a7c29e06545 100644
--- a/Source/platform/fonts/cocoa/FontPlatformDataCocoa.mm
+++ b/Source/platform/fonts/cocoa/FontPlatformDataCocoa.mm
@@ -290,28 +290,9 @@ SkTypeface* FontPlatformData::typeface() const{
 }
 
 #if OS(MACOSX)
-static bool isAATFont(CTFontRef ctFont)
-{
-    CFDataRef table = CTFontCopyTable(ctFont, kCTFontTableMort, 0);
-    if (table) {
-        CFRelease(table);
-        return true;
-    }
-    table = CTFontCopyTable(ctFont, kCTFontTableMorx, 0);
-    if (table) {
-        CFRelease(table);
-        return true;
-    }
-    return false;
-}
-
 HarfBuzzFace* FontPlatformData::harfBuzzFace()
 {
     CTFontRef font = ctFont();
-    // HarfBuzz can't handle AAT font
-    if (isAATFont(font))
-        return 0;
-
     if (!m_harfBuzzFace) {
         uint64_t uniqueID = reinterpret_cast<uintptr_t>(font);
         m_harfBuzzFace = HarfBuzzFace::create(const_cast<FontPlatformData*>(this), uniqueID);