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This reverts commit eb0d6e13.

Reason for revert: This CL causes a crash on AMD device, b/117398307

Original change's description:
> Use ARGB8888 for a dummy buffer for protected content playbkack on ARC++
> 
> We have specified R8 format for a dummy buffer for protected content playback
> on ARC++.
> R8 format is not supported on exynos device. It leads crash on the devices.
> ARGB8888 should be used instead, which is widely supported on all Chrome OS
> device.
> 
> BUG=chromium:787660, chromium:887658
> TEST=No crash on peach_pit and Protected content playback on veyron_minnie and eve
> 
> Change-Id: Ia550277ad30a0e0fd814106a1610b59a1a86bb03
> Reviewed-on: https://chromium-review.googlesource.com/1242564
> Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
> Reviewed-by: Pawel Osciak <posciak@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#593842}

TBR=posciak@chromium.org,gurchetansingh@chromium.org,hiroh@chromium.org

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

Bug: chromium:787660, chromium:887658
Change-Id: I7cc4e8607b0dd267f73a2f32879abae74f9fa24e
Reviewed-on: https://chromium-review.googlesource.com/c/1282505Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599824}