Revert "[PM] Lift OwnedObjects DCHECK limit to unblock failing tests"

This reverts commit f547922f.

Reason for revert: Misdiagnosis, the DCHECK failed due to an object leak.

Original change's description:
> [PM] Lift OwnedObjects DCHECK limit to unblock failing tests
>
> Bug: 346612453
> Change-Id: I8816b86929ee5a281724561dd77217ab9a81a8a9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5622254


> Reviewed-by: Patrick Monette <pmonette@chromium.org>
> Commit-Queue: Patrick Monette <pmonette@chromium.org>
> Auto-Submit: Joe Mason <joenotcharles@google.com>
> Commit-Queue: Joe Mason <joenotcharles@google.com>
> Cr-Commit-Position: refs/heads/main@{#1313692}

Bug: 346612453
Change-Id: I911c28f6b618a50b06c866f7dff90bba2e4914a3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5626955
Auto-Submit: Joe Mason <joenotcharles@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1314128}