Developer credits
Git commits in Moodle 3.9.2 by Justin Hunt
commit d46ee17722500428b9cb219648e1de44d77fe4b7 Author: Justin Hunt <poodllsupport@gmail.com> Date: Tue, 01 Oct 2019 14:40:04 +0800 Tag: v3.9.2 MDL-66810 mod_lti: Reinstate deprecated default permissions on iframe