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This reverts commit 064c1945.

Reason for revert: crbug.com/1044380

Original change's description:
> viz: OverlayProcessor Sends Candidate Directly for Android Pre-SC
> 
> For Andorid Pre-SurfaceControl, overlay processor can send the
> overlay candidates directly.
> 
> This is CL 6/? for sending the overlay candidates directly to gpu thread.
> 
> R=​rjkroege
> 
> Bug: 979788
> Change-Id: I76d97e8c8cfece078f6ea8d90bf8d3e7ae02dbfc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985305
> Commit-Queue: weiliangc <weiliangc@chromium.org>
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#733619}

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

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

Bug: 979788
Change-Id: I9cc2033bf6145b5d0b59e0680b7265403927b913
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013811Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734076}