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We set mb_skip_coeff and loop_filter_adj_enable to 1 in crrev.com/c/1773662.
They are mainly for a workaround that some decoders shows artifacts with the
VP8 stream produced by an intel encoder.
After some investigations, it turns out they are a proper fix.
This CL updates the reasons in the comment why those parameters are set to 1.

no artifact is there

Bug: b:139766881, b:138840822
Test: decode VP8 stream produced by Intel encoder on eve and atlas, and confirm
Change-Id: I6e4e4425edfd59e9be70680c32786d5a95aa9d17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792219Reviewed-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697410}