Revert "remove webkit-prefix from font-feature-settings"

This reverts commit 4daf0694a6.

core.rkt

@@ -80,10 +80,7 @@
   
   (join-css-strings (append
                      (make-css-strings '("-moz-") feature-tag-property feature-tag-string-old-firefox)
-                     ;; Safari no longer supports OT features
+                     (make-css-strings css-property-prefixes feature-tag-property feature-tag-string))))
-                     ;; Chrome 37 on OS X breaks them
-                     ;; so remove webkit from OT features for now
-                     (make-css-strings (remove "-webkit-" css-property-prefixes) feature-tag-property feature-tag-string))))
 
 
 (define (make-css-hyphens [value "auto"])