Bug 1738426 - Ignoring status 206 and vary header checking for opaque response in Cache API. r=asuth

Differential Revision: https://phabricator.services.mozilla.com/D186431

Bug 1802057 - Block the following characters from use in the cookie name in the cookie string: 0x3B (semi-colon), 0x3D (equals), and 0x7F (del) r=dveditz,cookie-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D182373

We could do non-racy static init here (e.g. with a static initializer
self-calling-closure), but there doesn't seem to be a strong reason for
this. Let's just use a switch and get robustness from -Werror=switch.

Differential Revision: https://phabricator.services.mozilla.com/D188054

Differential Revision: https://phabricator.services.mozilla.com/D186676

This also specializes ElementStreamFormat for bool.

Differential Revision: https://phabricator.services.mozilla.com/D187794

Differential Revision: https://phabricator.services.mozilla.com/D187887

Similar to MediaTrack::mDisabledMode, but this is for uses on the
SourceMediaTrack producer thread. It is still signaled via a control message
from the control thread to maintain order of operations, and is protected by the
SourceMediaTrack mutex.

Differential Revision: https://phabricator.services.mozilla.com/D187554