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* Every subclass of `Walker` overrides `$db_fields` and makes it public * `wp_list_comments()` accesses `->max_pages` on an instance of `Walker`, it must be public * `$has_children` was added as `protected` in 4.0. doesn't need BC Make `$db_fields` and `$max_pages` public and remove magic methods. See #30891. git-svn-id: https://develop.svn.wordpress.org/trunk@31137 602fd350-edb4-49c9-b593-d223f7449a82