At long last, improved keyboard accessibility for the media modal.

props lessbloat, grahamarmfield, sharonaustin, bramd.
see #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@28431 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Better align link element focus with form focus styling, which also improves the visibility. props zamfeer. see #28267.

Built from https://develop.svn.wordpress.org/trunk@28608


git-svn-id: http://core.svn.wordpress.org/trunk@28432 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Forcing SSL logins now forces SSL for the entire admin, with no middle ground.

fixes #10267.

Built from https://develop.svn.wordpress.org/trunk@28609


git-svn-id: http://core.svn.wordpress.org/trunk@28433 1a063a9b-81f0-0310-95a4-ce76da25c4cd