Also switch the XPCOM-y version of EventTarget::AddEventListner to a
Nullable<bool> for aWantsUntrusted.
The three-arg overload of AddEventListener in ContentFrameMessageManager was
never called, so all the AddEventListener overloads there are not needed.
MozReview-Commit-ID: 4IhqHmPVWzE
The change in browser_net_view-source-debugger.js is needed because we now use WebIDL callbacks for MessageListener, and they add async creation stack frames.
The change in browser_net_view-source-debugger.js is needed because we now use WebIDL callbacks for MessageListener, and they add async creation stack frames.
