service worker: Remove workaround for ServiceWorkerObjectHost crash.

Since issue 864731 was fixed in r576288, this workaround is no longer
needed.

Bug: 854993
Change-Id: I789dfb18cdb82ec51aa0ce5185586163c92269ec
Reviewed-on: https://chromium-review.googlesource.com/1147889
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577435}
1 file changed