Consolidate "close on Escape" in the media modal, DFW, wpLink and Thickbox. Props kovshenin, fixes #26854.
Built from https://develop.svn.wordpress.org/trunk@27080


git-svn-id: http://core.svn.wordpress.org/trunk@26953 1a063a9b-81f0-0310-95a4-ce76da25c4cd