Author: Frédéric Massart
MDL-61984 mod_chat: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=113e66d70b6c74f8134cf256e9b9d60319f0cfc1
http://github.com/moodle/moodle/commit/113e66d70b6c74f8134cf256e9b9d60319f0cfc1
+ 3.3 en [privacy:metadata:messages,mod_chat]
+ 3.3 en [privacy:metadata:messages:issystem,mod_chat]
+ 3.3 en [privacy:metadata:messages:message,mod_chat]
+ 3.3 en [privacy:metadata:messages:timestamp,mod_chat]
+ 3.3 en [privacy:metadata:messages:userid,mod_chat]