Bug 1493743 - speculative patch - Set type to None rather than Named in default FontFamilyName constructor, as no name is provided. r=lsalzman

gfx/thebes/gfxFontFamilyList.h

@@ -57,7 +57,7 @@ enum QuotedName { eQuotedName, eUnquotedName };
 
 struct FontFamilyName final {
     FontFamilyName()
-        : mType(eFamily_named)
+        : mType(eFamily_none)
     {}
 
     // named font family - e.g. Helvetica