Tests the way service worker manager manages targets.
Target added: Main; type: frame
Target added: service-worker-empty.js; type: service-worker
Target removed: service-worker-empty.js; type: service-worker
Tests the way service worker manager manages targets.
Target added: Main; type: frame
Target added: service-worker-empty.js; type: service-worker
Target removed: service-worker-empty.js; type: service-worker