Use correct function name. props ocean90. fixes #23942. see #23927.

git-svn-id: http://core.svn.wordpress.org/trunk@23911 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WP_Upgrader: Add upgrader_process_complete hooks and add a abort_if_destination_exists flag (default is true). props dd32. see #18200.



git-svn-id: http://core.svn.wordpress.org/trunk@23912 1a063a9b-81f0-0310-95a4-ce76da25c4cd