Adapt ServiceWorkerGlobalScope API to new events structure (#15207)
Adapt ServiceWorkerGlobalScope API to new events structure (#15207)

This PR adapts the ServiceWorkerGlobalScope API to conform to the new events structure.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data