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This reverts commit d6027891.

Reason for revert: Suspect for crbug.com/1008178

Original change's description:
> Convert nacl.mojom to new Mojo types
>
> This CL converts NaClRendererHost and NaClExitControl
> to new Mojo types.
>
> It also updates ProvideExitControl from nacl.mojom
> and methods and members which implement it.
>
> Bug: 955171
> Change-Id: Ie6b875e07796b08818825474e8493e5f48072c3f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810509
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Reviewed-by: Derek Schuff <dschuff@chromium.org>
> Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Commit-Queue: Julie Kim <jkim@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#697852}

TBR=dschuff@chromium.org,bbudge@chromium.org,sammc@chromium.org,oksamyt@chromium.org,jkim@igalia.com

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

Bug: 955171,1008178
Change-Id: I8bdeb5bdd842ffa95ca41fd009717d46c843c3fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829619
Commit-Queue: Jeongeun Kim <je_julie.kim@chromium.org>
Reviewed-by: Jeongeun Kim <je_julie.kim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700929}