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This reverts commit 0dadfa21.

Reason for revert: Top crasher on Canary.

Original change's description:
> PM: Enable service worker relationships by default.
>
> Bug: 1143281
> Change-Id: I5107ca4d324248456470f5880429d10760d77076
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2557223
> Reviewed-by: Patrick Monette <pmonette@chromium.org>
> Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#830661}

TBR=pmonette@chromium.org,siggi@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1152860, 1143281
Change-Id: Ie1e445d3da4185e65bfb8f895b6d63468b01be1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561538Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831161}