notification.close() not working

[Andy]

Calling notification.close() (from both inside and outside a service worker) doesn't remove the notification(s)

Use case:
Removing notifications that no longer apply to user, for instance if they have visited a page the notification would take them to.


To replicate
- Have a notification in Notification Centre created by current site
- get all notifications, then call notification.close()


From a window:
navigator.serviceWorker.ready.then(function(registration) {
	registration.getNotifications().then((notifications) => {
		for (let notification of notifications) {
			notification.close()
		}
	})
})

From within a service worker:
self.registration.getNotifications().then((notifications) => {
	for (let notification of notifications) {
		notification.close()
	}
})

Expected results
The notification in notification is removed

Actual result
The notification remains

[Radar WebKit Bug Importer]

<rdar://problem/102683841>

[youenn fablet]

Pull request: https://github.com/WebKit/WebKit/pull/6856

[EWS]

Committed 257108@main (d02120f1bc06): <https://commits.webkit.org/257108@main>

Reviewed commits have been landed. Closing PR #6856 and removing active labels.