Revert of relnote: Protect against a QUIC crash bug but logging a DFATAL and

Revert of relnote: Protect against a QUIC crash bug but logging a DFATAL and (patchset #1 id:1 of https://codereview.chromium.org/1246793002/)

Reason for revert:
The test added in this patch is crashing on Chrome OS.

See crbug.com/512417

Original issue's description:
> relnote: Protect against a QUIC crash bug but logging a DFATAL and
> closing the connection instead when a packet cannot be serialized.
>
> This could help fixing Chromium BUG=479880
.
>
> Merge internal change: 98506577
>
> R=rch@chromium.org
>
> Committed: https://crrev.com/0a2dccc01366309f1e55a9b86141137bb649c631
> Cr-Commit-Position: refs/heads/master@{#339532}

TBR=rch@chromium.org,rtenneti@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/5b1ea4388e2378f0af0ff5ff5631f47517166a9f
Cr-Commit-Position: refs/heads/master@{#339645}

[jonross, 2015-07-21 13:52:26]

Created Revert of relnote: Protect against a QUIC crash bug but logging a DFATAL
and

[commit-bot: I haz the power, 2015-07-21 13:52:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1248683002/1

[commit-bot: I haz the power, 2015-07-21 13:53:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-21 13:54:35]

Patchset 1 (id:??) landed as
https://crrev.com/5b1ea4388e2378f0af0ff5ff5631f47517166a9f
Cr-Commit-Position: refs/heads/master@{#339645}