Revert of Relax assert a little to fix flake on regress-3976 (patchset #1 id:1 of https://codereview.chromium.org/1045763002/)

Reason for revert:
Reverting due to JSOn parser failures

Original issue's description:
> Relax assert a little to fix flake on regress-3976
>
> R=verwaest@chromium.org
> NOTRY=true
> BUG=
>
> Committed: https://crrev.com/b20edd7772892ff8b2b280b35e521fbc2cc4a5f6
> Cr-Commit-Position: refs/heads/master@{#27515}

TBR=verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1050033003

Cr-Commit-Position: refs/heads/master@{#27561}