Bug 1335740 - getUserMedia() Add 2 prefs to control A) NotAllowedError in http (pref'd on), and B) [SecureContext] navigator.mediaDevices (pref'd off) r=bzbarsky,pehrsons

Differential Revision: https://phabricator.services.mozilla.com/D19549

--HG--
rename : testing/web-platform/meta/mediacapture-streams/historical.html.ini => testing/web-platform/meta/mediacapture-streams/historical.https.html.ini
rename : testing/web-platform/tests/mediacapture-streams/historical.html => testing/web-platform/tests/mediacapture-streams/historical.https.html
extra : moz-landing-system : lando