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This reverts commit 7fb78e28.

Reason for revert: Have enough DCHECK data, I believe.

Original change's description:
> PM: Enable service worker relationships.
>
> This change is to get some DCHECK crashes on Albatross. It will be
> reverted after it's been on Canary for a day or so.
>
> Bug: 1143281
> Change-Id: I6d125dfbae9699e7292a9aa0336070b005bd03c3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2571638
> Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
> Reviewed-by: Patrick Monette <pmonette@chromium.org>
> Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833405}

TBR=pmonette@chromium.org,siggi@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: 1143281
Change-Id: I72d3f973bb70f651df51a5d6a89c98f619fc6f12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577576Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834695}