Upgrade TinyMCE to 3.5.9. Fix the css for the original 'fullscreen' plugin (not enabled by default).
Fixes #25561, fixes #25281.

Built from https://develop.svn.wordpress.org/trunk@25761


git-svn-id: http://core.svn.wordpress.org/trunk@25674 1a063a9b-81f0-0310-95a4-ce76da25c4cd