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This reverts commit b4fd0cc9.

Reason for revert: The Squid app uses SingleOnTop for overlay without changing the resource_id. This revert will undo the fix for the other apps, but they're lower priority.

Original change's description:
> Skip promoting SingleOnTop Overlay when contents don't change
>
> If a candidate content has not changed for 3 frames, do not promote it as
> Single On Top overlay as it can be just be flattened, allowing other
> strategies to kick in if possible.
>
> Bug: 885180
> Test: SingleOverlayOnTopTest.DoNotPromoteIfPreviouslyPromoted
> Change-Id: I516dab628c129fe9fae09c713e2783a6ce889c56
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1521591
> Commit-Queue: Mark Yacoub <markyacoub@google.com>
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#645367}

TBR=dcastagna@chromium.org,markyacoub@google.com

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

Bug: 885180
Change-Id: I799bd22f06a56d86844a63d5ac346f41bcfb8707
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635931Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Cr-Commit-Position: refs/heads/master@{#664734}