Author: Andrew Nicols
MDL-61398 block_html: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5731a92aa77d917aff2da4c94a3424cd6dbe7339
http://github.com/moodle/moodle/commit/5731a92aa77d917aff2da4c94a3424cd6dbe7339
+ 3.5 en [privacy:metadata:block,block_html]