Leverage WP_Theme in the upgrader. Remove debug line from [20267]. Stop using...

Leverage WP_Theme in the upgrader. Remove debug line from [20267]. Stop using get_theme_data() as it will be deprecated. see #13774. see #20103.



git-svn-id: https://core.svn.wordpress.org/trunk@20268 1a063a9b-81f0-0310-95a4-ce76da25c4cd