service worker: WPT: Add generated response tests for XHR response URL.

respondWith(new Response()) is a little tricky for response URL so it's
good to have a test for it.

Bug: 915126
Change-Id: I21fbc654687d467baf14f02c23f4e41d18ac79ab
Reviewed-on: https://chromium-review.googlesource.com/c/1415613
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623577}
3 files changed