ServiceWorker: Modernize clients-matchall-include-uncontrolled.https.html using async/await

Bug: 902201
Change-Id: Ib9fd5a5f0e9cc49cf653b6af768d00912c008deb
Reviewed-on: https://chromium-review.googlesource.com/c/1319392
Commit-Queue: Hiroki Nakagawa <[email protected]>
Reviewed-by: Matt Falkenhagen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#605617}
1 file changed