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* Declare `$extra_items` property * Since `->get_column_info()` overrides its parent's method, it doesn't need to set `_column_headers`, which is an undeclared property that is only used for caching the lookup after the first run in the parent class, which isn't called in the child class. * `$_args` in `WP_List_Table` has to be `protected` for `WP_Post_Comments_List_Table` to legally access it. `$_args` is awkward as is and should probably be only available via a getter. See #30799. git-svn-id: https://develop.svn.wordpress.org/trunk@30984 602fd350-edb4-49c9-b593-d223f7449a82