Relax assert a little to fix flake on regress-3976

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}

[Toon Verwaest, 2015-03-30 10:24:03]

lgtm

[Erik Corry Chromium.org, 2015-03-30 10:25:05]

The CQ bit was checked by erikcorry@chromium.org

[commit-bot: I haz the power, 2015-03-30 10:25:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045763002/1

[Erik Corry Chromium.org, 2015-03-30 10:36:53]

The CQ bit was unchecked by erikcorry@chromium.org

[Erik Corry Chromium.org, 2015-03-30 10:37:15]

The CQ bit was checked by erikcorry@chromium.org

[commit-bot: I haz the power, 2015-03-30 10:37:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045763002/1

[commit-bot: I haz the power, 2015-03-30 10:37:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-30 10:37:43]

Patchset 1 (id:??) landed as
https://crrev.com/b20edd7772892ff8b2b280b35e521fbc2cc4a5f6
Cr-Commit-Position: refs/heads/master@{#27515}

[Erik Corry Chromium.org, 2015-04-01 09:20:29]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1050033003/ by erikcorry@chromium.org.

The reason for reverting is: Reverting due to JSOn parser failures.