ServiceWorkerGlobalScope::skipWaiting() should resolve its promise

ServiceWorkerGlobalScope::skipWaiting() should resolve its promise
https://bugs.webkit.org/show_bug.cgi?id=180204

Reviewed by Brady Eidson.

LayoutTests/imported/w3c:

Rebaseline test which uses skipWaiting().

* web-platform-tests/service-workers/service-worker/claim-with-redirect.https-expected.txt:

Source/WebCore:

ServiceWorkerGlobalScope::skipWaiting() should resolve its promise, even if it is not
implemented yet. For now, always reject the promise.

* workers/service/ServiceWorkerGlobalScope.cpp:
(WebCore::ServiceWorkerGlobalScope::skipWaiting):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@225346 268f45cc-cd09-0410-ab3c-d52691b4dbfc