Backed out 4 changesets (bug 1584479) for Browser-chrome failures in toolkit/components/antitracking/test/browser/browser_socialtracking.js

Backed out changeset b0d9877bd8b0 (bug 1584479)
Backed out changeset d2c56bd61b08 (bug 1584479)
Backed out changeset 0edb22786545 (bug 1584479)
Backed out changeset 7e03b392edb3 (bug 1584479)