We used to use nsContentUtils::IsThirdPartyWindowOrChannel() to
determine the third-party channel when annotate the channel in
UrlClassifierCommon. Howeverm This is fission-incompatible. So, we
change it to use AntiTrackingUtils::IsThirdPartyChannel() which is
fission-compatible.
Differential Revision: https://phabricator.services.mozilla.com/D75187