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This CL prevents the safety check Chrome cleaner child from sending
additional SC parent completion events to the UI when the Chrome cleaner
status changes in the backend.

Bug: 1087263
Change-Id: I80c8c2549053460e20fadd03d91deab97f4cda6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527381Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825487}