Fix torbutton proxy api due to change in Firefox 77.
We should fix torbutton code due to the breaking API change in nsIProtocolProxyFilter
from https://bugzilla.mozilla.org/show_bug.cgi?id=1584797.
We should fix torbutton code due to the breaking API change in nsIProtocolProxyFilter
from https://bugzilla.mozilla.org/show_bug.cgi?id=1584797.