The hardware video decoder outputs color artifacts with av1 film
grain streams. We deny av1 film grain streams so that software
decoders are instead used for them.

Bug: b:176927551
Test: No artifacts with film grain streams (i.e. software decoders are used) on volteer
Change-Id: I85eceb0a82ee6e021943194d2429c1c6be87fe4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615723
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843393}