Revert of Add IsAlternativeServiceBroken(), remove is_broken.

Revert of Add IsAlternativeServiceBroken(), remove is_broken. (patchset #4 id:60001 of https://codereview.chromium.org/995013004/)

Reason for revert:
Linux bots failing with:

Check failed: network_task_runner_->RunsTasksOnCurrentThread()

Original issue's description:
> Add IsAlternativeServiceBroken(), remove is_broken.
>
> Add HttpServerProperties::IsAlternativeServiceBroken(), remove
> AlternateProtocolInfo.is_broken.  An alternative service can be broken by
> itself, not with respect to an origin.
>
> BUG=392576
> R=rch@chromium.org
>
> Committed: https://crrev.com/c0844e78ad3dd640f6a2a84f57681ead31647b07
> Cr-Commit-Position: refs/heads/master@{#320116}

TBR=rch@chromium.org,bnc@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=392576
Committed: https://crrev.com/fe9f1976d997a6a431c012d067b1157d8b078138
Cr-Commit-Position: refs/heads/master@{#320146}

[Lei Zhang, 2015-03-11 21:00:43]

Created Revert of Add IsAlternativeServiceBroken(), remove is_broken.

[commit-bot: I haz the power, 2015-03-11 21:01:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/999893002/1

[commit-bot: I haz the power, 2015-03-11 21:04:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-11 21:05:17]

Patchset 1 (id:??) landed as
https://crrev.com/fe9f1976d997a6a431c012d067b1157d8b078138
Cr-Commit-Position: refs/heads/master@{#320146}