chore(mc): Port Bug 1481021: Part 1 - Fix tests that rely on permissive COWs or SpecialPowers side-effects in frame script scopes. r=bz
chore(mc): Port Bug 1481021: Part 1 - Fix tests that rely on permissive COWs or SpecialPowers side-effects in frame script scopes. r=bz

Mardak/activity-stream,Mardak/activity-stream,mozilla/activity-stream,mozilla/activity-stream,mozilla/activity-stream,mozilla/activity-stream,AdamHillier/activity-stream,sarracini/activity-stream,sarracini/activity-stream,AdamHillier/activity-stream,rlr/activity-streams,rlr/activity-streams,AdamHillier/activity-stream,AdamHillier/activity-stream,rlr/activity-streams,mozilla/activity-streams,Mardak/activity-stream,sarracini/activity-stream,mozilla/activity-streams,rlr/activity-streams,sarracini/activity-stream,Mardak/activity-stream