Eliminate use of `extract()` in `trackback_url_list()`. 

See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28382 602fd350-edb4-49c9-b593-d223f7449a82
Eliminate use of `extract()` in `the_title_attribute()`. 

See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28383 602fd350-edb4-49c9-b593-d223f7449a82