Backed out 4 changesets (bug 1624268) for causing brwoser-chrome failure at toolkit/components/antitracking/test/browser/browser_partitionedSharedWorkers.js

CLOSED TREE

Backed out changeset d58da2438eee (bug 1624268)
Backed out changeset 06adb66489b8 (bug 1624268)
Backed out changeset c947c72829a6 (bug 1624268)
Backed out changeset 8af99a5ecd54 (bug 1624268)