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This reverts commit b8dd353f.

Reason for revert: parent CL crrev.com/c/1725033 breaks betty-arcnext-chrome-pfq

Original change's description:
> viz: Use Build Flags to Maintain Single Overlay Candidate Type
>
> For each platform, we only use one overlay candidate type. Use build
> flags to manage that. This also helps unify different platform's
> ProcessForOverlay API.
>
> R=​rjkroege
>
> Bug: 963597
> Change-Id: Icf0de8b30928cb4e7c23a3573eb46591191fb804
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1664476
> Commit-Queue: weiliangc <weiliangc@chromium.org>
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#680522}

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

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

Bug: 963597, 988114
Change-Id: I0a97ba8e96bdd5abe4f6250ad2f681a23327e282
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725434
Commit-Queue: Shao-Chuan Lee <shaochuan@chromium.org>
Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682181}