Cleanup after [29220]:

`media.controller.Library` is State/Backbone Model and should not touch views.

See #23560.

Built from https://develop.svn.wordpress.org/trunk@29558


git-svn-id: http://core.svn.wordpress.org/trunk@29333 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView: add a filter for the stylesheet URLs loaded in the sandbox iframes. See #29048.
Built from https://develop.svn.wordpress.org/trunk@29559


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