Use forEach and destructuring for parsing features

lib/browser/guest-view-manager.js

@@ -193,7 +193,7 @@ const attachGuest = function (embedder, elementInstanceId, guestInstanceId, para
         // no value was specified, default it to true
         value = true
       }
-      webPreferences[name] = value
+      webPreferences[key] = value
     })
   }