Press This fixes:

* Override responsive styles for the Press This window
* Remove the old header logo in Press This
* Add the new Dashicon WP logo

See #25858.


Built from https://develop.svn.wordpress.org/trunk@26433


git-svn-id: http://core.svn.wordpress.org/trunk@26331 1a063a9b-81f0-0310-95a4-ce76da25c4cd