Author: Mark Nelson
MDL-61764 message_popup: implement privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=10efd23b7c2fb6e64932fc23deae886b4ed46255
http://github.com/moodle/moodle/commit/10efd23b7c2fb6e64932fc23deae886b4ed46255
+ 3.5 en [privacy:metadata,message_popup]