TinyMCE: add stubs for the missing tinymce.util.Cookie, windowManager.onOpen and windowManager.onClose to the compat3x plugin. See #24067, fixes #26750.
Built from https://develop.svn.wordpress.org/trunk@26890


git-svn-id: http://core.svn.wordpress.org/trunk@26773 1a063a9b-81f0-0310-95a4-ce76da25c4cd