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This reverts commit 8555baec.

Reason for revert: Still seeing the CHECK in performance_manager::WorkerWatcher::RemoveChildWorker.

Original change's description:
> Reland "PM: Enable service worker relationships."
>
> This is a reland of 7fb78e28
> The crashes and DCHECKs should be fixed with
> https://crrev.com/c/2581939.
>
> 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}
>
> Bug: 1143281
> Change-Id: I52a8332dcd151cd42d6e85f5bbaf4dc094e7d995
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582726
> Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
> Commit-Queue: Joe Mason <joenotcharles@chromium.org>
> Auto-Submit: Sigurður Ásgeirsson <siggi@chromium.org>
> Reviewed-by: Joe Mason <joenotcharles@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#835338}

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

Change-Id: I98ecff2b9d75be2ac914e923f7674387d45774ac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1143281
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584704Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835699}