Revert 181541 "Merge FontPlatformDataHarfBuzz and FontPlatformData headers"

Source/platform/mac/WebFontCache.mm

Index: Source/platform/mac/WebFontCache.mm
diff --git a/Source/platform/mac/WebFontCache.mm b/Source/platform/mac/WebFontCache.mm
index d295ad58327406c6e7680caf4acdaf93e96b02f6..b257596d2cf26a8903a0405949a5870edd5f43d1 100644
--- a/Source/platform/mac/WebFontCache.mm
+++ b/Source/platform/mac/WebFontCache.mm
@@ -189,7 +189,7 @@ static BOOL betterChoice(NSFontTraitMask desiredTraits, int desiredWeight,
     int actualWeight = [fontManager weightOfFont:font];
 
     bool syntheticBold = desiredWeight >= 7 && actualWeight < 7;
-    bool syntheticItalic = (desiredTraits & NSFontItalicTrait) && !(actualTraits & NSFontItalicTrait);
+    bool syntheticOblique = (desiredTraits & NSFontItalicTrait) && !(actualTraits & NSFontItalicTrait);
 
     // There are some malformed fonts that will be correctly returned by -fontWithFamily:traits:weight:size: as a match for a particular trait,
     // though -[NSFontManager traitsOfFont:] incorrectly claims the font does not have the specified trait. This could result in applying 
@@ -201,7 +201,7 @@ static BOOL betterChoice(NSFontTraitMask desiredTraits, int desiredWeight,
     if (syntheticBold)
         nonSyntheticTraits &= ~NSBoldFontMask;
 
-    if (syntheticItalic)
+    if (syntheticOblique)
         nonSyntheticTraits &= ~NSItalicFontMask;
 
     if (nonSyntheticTraits != desiredTraits) {