Fix wpt: service-worker/navigation-redirect.https.html

As preparation for adding FetchEvent#resultingClientId, this CL fixes
the test to make it pass once resultingClientId is impelmeneted.

Bug: 778497
Change-Id: I6309a13d4315e6a99149275a6d7889f14ce0d757
Reviewed-on: https://chromium-review.googlesource.com/c/1335055
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608167}
2 files changed