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Revert of Update OTS to revision 6d2e08b (patchset #1 id:1 of https://codereview.chromium.org/1062093002/)

Reason for revert:
This CL caused many tests fail on uninit read errors reported by MSan

BUG=474597

Original issue's description:
> Update OTS to revision 6d2e08b
>
> This brings in a bugfix of checksum calculation that caused assertion
> failure on debug builds.
>
> BUG=464780
>
> Committed: https://crrev.com/3a672fe050438bc787af3f9bb652048291558c6c
> Cr-Commit-Position: refs/heads/master@{#324023}

TBR=bashi@chromium.org,ksakamoto@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=464780

Review URL: https://codereview.chromium.org/1064913002

Cr-Commit-Position: refs/heads/master@{#324046}