Automattic/_s — pull request #650 by fklein-lu (2014-11-20 20:51:52+00:00)
Title: Remove custom header admin callbacks.

With [#25571](https://core.trac.wordpress.org/ticket/25571) landing in Core, the Custom Header page under Appearance will now redirect to the corresponding section in the Customizer.

This allows us to remove the callback functions that were used to style the old Custom Header page.