WPT: service worker: Add test for updating due to redirects in navigations.

Handle Fetch algorithm:
  If request is a non-subresource request...invoke Soft Update algorithm
  with registration.
https://w3c.github.io/ServiceWorker/#on-fetch-request-algorithm


Bug: 865839
Change-Id: I56eb447313171eebd2da4b4eb79771e8b89e212b
Reviewed-on: https://chromium-review.googlesource.com/1144584
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576805}
2 files changed