Revert "Reject corrupted frames in the VP8 video decoder."

This reverts commit ba511622a24945fdd2b5b26b5a9275f0c6daff5e.

Reason for revert: breaks downstream test

Original change's description:
> Reject corrupted frames in the VP8 video decoder.
>
> The libvpx VP8 decoder has always returned error on malformed keyframes
> but it turns out that corrupted delta frames may actually decode with
> error, upon which the decoder still returns `VPX_CODEC_OK`. It is then
> up to the user to poll the `VP8D_GET_FRAME_CORRUPTED` flag to see if it
> was indeed OK.
>
> This CL adds a unit test the demonstrated this condition and shows that
> we now reject the corrupted frame instead of continuing with error.
>
> Bug: chromium:561396583
> Change-Id: I1e5c65225fc389be8b37d4c7da9a2cbf9a0c6ec2
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/505800
> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> Commit-Queue: Erik Språng <sprang@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#48727}

Bug: chromium:561396583, b/566204684
Change-Id: I862d07778dfa77aa9615ddda1e96c4b2925d25b7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/505880
Auto-Submit: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#48736}