Gary Pendergast 6774e27ae7 General: Restore usage of $wpdb, instead of $this->db.
Hiding the `$wpdb` global behind a property decreases the readability of the code, as well as causing irrelevant output when dumping an object.

Reverts [38275], [38278], [38279], [38280], [38387].
See #37699.



git-svn-id: https://develop.svn.wordpress.org/trunk@38768 602fd350-edb4-49c9-b593-d223f7449a82
2016-10-10 06:37:02 +00:00
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