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* Logs the Chrome cleaner result shown to users in an UMA histogram.

Bug: 1087263
Change-Id: I25cdd664300632f3d893f59a01c3803ce3db6f86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332802
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795595}