Schedule auto-draft deletion from post-new.php instead of from admin.php. This...

Schedule auto-draft deletion from post-new.php instead of from admin.php. This provides better throttling for large multisite installs and reduces the risk of a delete avalanche.

fixes #19663


git-svn-id: https://core.svn.wordpress.org/trunk@20453 1a063a9b-81f0-0310-95a4-ce76da25c4cd