ServiceWorkerRegistration class

1. Properties
2. active
3. backgroundFetch
4. installing
5. navigationPreload
6. paymentManager
7. pushManager
8. scope
9. sync
10. waiting
11. hashCode
12. on
13. runtimeType
14. Methods
15. getNotifications
16. showNotification
17. unregister
18. update
19. addEventListener
20. dispatchEvent
21. noSuchMethod
22. removeEventListener
23. toString
24. Operators
25. operator ==