Update getServiced tests.

Conflicts:
	dom/workers/test/serviceworkers/sw_clients/service_worker_controlled.html
	dom/workers/test/serviceworkers/test_get_serviced_advanced.html
	dom/workers/test/serviceworkers/test_get_serviced_enumerate.html
	dom/workers/test/serviceworkers/test_post_message_advanced.html
Fix swclient.postMessage(blob), fix assert when a registration is removed during a getServiced call.