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This reverts commit 9fc3225d.

Reason for revert: Top crasher on canary

Original change's description:
> [PM] Add service worker clients to the graph
> 
> Bug: 993029
> Change-Id: I87e33b72d6a340c48e4a9780c21de4c8693e42f0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2175552
> Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
> Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
> Commit-Queue: Patrick Monette <pmonette@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#773049}

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

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

Bug: 993029, 1088353
Change-Id: I44a27a0a47278b38287d8d545334e758f3a524e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225848Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774308}