This reverts commit f60d1dcd.

Reason for revert: <INSERT REASONING HERE>
Failures in AVX/VP9QuantizeTest in nightly tests.
Original change's description:
> quantize avx: copy 32x32 implementation
> 
> Ensure avx and ssse3 stay in sync by testing them against each other.
> 
> Change-Id: I699f3b48785c83260825402d7826231f475f697c

TBR=slavarnway@google.com,johannkoenig@google.com,builds@webmproject.org

Change-Id: Ibd38636212269328317dd0721be9d25452113d1c
No-Presubmit: true
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