Revert [35804]. This change has unintended side effects, notably that media...

Revert [35804]. This change has unintended side effects, notably that media URLs in the admin area now unexpectedly use the `https` scheme. A more comprehensive approach will be taken in 4.5.

See #13941, #35120

Built from https://develop.svn.wordpress.org/trunk@36061


git-svn-id: https://core.svn.wordpress.org/trunk@36026 1a063a9b-81f0-0310-95a4-ce76da25c4cd