Update the Scribd oEmbed pattern to more actually represent which endpoints from the site are discoverable.

See #28379.


git-svn-id: https://develop.svn.wordpress.org/trunk@28595 602fd350-edb4-49c9-b593-d223f7449a82
RIP Viddler oEmbed support.

More: https://gigaom.com/2014/02/07/viddler-gets-ready-to-delete-personal-videos/

See #28379.



git-svn-id: https://develop.svn.wordpress.org/trunk@28596 602fd350-edb4-49c9-b593-d223f7449a82