Reduce references to the $wp_rewrite global because it's no longer used or a...

Reduce references to the $wp_rewrite global because it's no longer used or a wrapper function can be used instead. Fixes #14546.#14546.


git-svn-id: https://core.svn.wordpress.org/trunk@20023 1a063a9b-81f0-0310-95a4-ce76da25c4cd