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This reverts commit 39fc8ffd.

Reason for revert: https://crbug.com/1142776.

Original change's description:
> [PM] Add service worker clients to the graph.
>
> This is lifted from Pat's change at
> https://chromium-review.googlesource.com/c/chromium/src/+/2355089
>
> Bug: 993029, 1088353, 1121069
> Change-Id: Ibdc91c07a235be347cbe1704f0fe5e77cff73470
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490221
> Reviewed-by: Patrick Monette <pmonette@chromium.org>
> Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820771}

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

Change-Id: I3f7f5694c7e2ed98a176a9521eea551f51e2eb61
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 993029
Bug: 1088353
Bug: 1121069
Bug: 1142776
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502788Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821207}