CSS: Don't name the anonymous swap function
CSS: Don't name the anonymous swap function

IE8 doesn't like named anonymous expressions. Not naming the function
expression reduces the gzipped size by 5 bytes.

In ECMAScript 2015 the function will get the name inferred from the
variable name (here: swap) anyway.

(cherry-picked from e847574fc755b5339f3de41bcebd5b2a3e140cfe)

Refs 02a9d9f94b623ea8664b7b39fd57feb7de6c6a14

roytoo/jquery,jquery/jquery,jquery/jquery,jquery/jquery,roytoo/jquery,roytoo/jquery