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This reverts commit 89eb64aa.

Reason for revert: Suspect this breaks the Mac display.

Original change's description:
> viz: Merge CA Overlay Validator into a Subclass of Overlay Processor
> 
> CA Overlay Validator has simple logic and could be easily merged into
> a subclass of overlay processor.
> 
> R=​rjkroege
> 
> Bug: 963597
> Change-Id: Ia6334b82a8826740098ad279b74cd044ff4d8d42
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1664973
> Commit-Queue: weiliangc <weiliangc@chromium.org>
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#681186}

TBR=rjkroege@chromium.org,weiliangc@chromium.org

Change-Id: Icd40d3893d1fa71d09764864536eb442a733c0d1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 963597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1721496Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681400}