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This reverts commit c47b4d11.

BUG=chromium:791131
TEST=video_ChromeRTCHWDecodeUsed on peach_pit
Reason for revert: This CL breaks video_ChromeRTCHWDecodeUsed

Original change's description:
> WebRTC: Migrate completely to new video codec factories API
> 
> This CL makes the Chromium HW video factories implement the new
> interfaces directly. It also adds SW codecs, simulcast, and SW fallback
> codecs manually, instead of relying on WebRTC to do this. This will
> give Chromium more flexibility in the future, and will allow us to
> simplify the WebRTC code, since it's only Chromium that uses some of
> these features.
> 
> Bug: webrtc:7925
> Change-Id: I2bbd8b9a8c52bfe963d601f34188faf47d59e67e
> Reviewed-on: https://chromium-review.googlesource.com/788410
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Emircan Uysaler <emircan@chromium.org>
> Commit-Queue: Magnus Jedvert <magjed@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#520062}

TBR=haraken@chromium.org,emircan@chromium.org,magjed@chromium.org

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

Bug: webrtc:7925
Change-Id: I081f9f5d961707924fe6eed4a97ead9c9f5ed12c
Reviewed-on: https://chromium-review.googlesource.com/810429Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Pawel Osciak <posciak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522056}