Revert of Add a crash-hunting CHECK() in RenderProcessHostImpl::AddRoute()

Revert of Add a crash-hunting CHECK() in RenderProcessHostImpl::AddRoute() (patchset #1 id:1 of https://codereview.chromium.org/647623003/)

Reason for revert:
per bug https://code.google.com/p/chromium/issues/detail?id=422694 a bunch of crashes both in mac and windows today's canary.

Original issue's description:
> Add a crash-hunting CHECK() in RenderProcessHostImpl::AddRoute()
>
> This is an equivalent of DCHECK() in IDMap.
> According to crbug.com/381990, this can occasionally crash.
> I'd like to enable this to collect more data if it still crashes.
> If you see this CHECK() being hit in the wild,
> please revert this change and let me know.
>
> BUG=381990, 415059
> R=nasko@chromium.org, amineer@chromium.org
>
> Committed: https://crrev.com/9a8e3d71f73ace82874d53ba2e749b1173a98513
> Cr-Commit-Position: refs/heads/master@{#299146}

TBR=amineer@chromium.org,nasko@chromium.org,karen@chromium.org,morrita@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=381990, 415059
Committed: https://crrev.com/9a04b3c3f9c85da4510eba67095b61bec78d7b6b
Cr-Commit-Position: refs/heads/master@{#299248}

[kareng, 2014-10-11 19:30:18]

Created Revert of Add a crash-hunting CHECK() in
RenderProcessHostImpl::AddRoute()

[commit-bot: I haz the power, 2014-10-11 19:30:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/645233003/1

[commit-bot: I haz the power, 2014-10-11 19:31:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-11 19:32:00]

Patchset 1 (id:??) landed as
https://crrev.com/9a04b3c3f9c85da4510eba67095b61bec78d7b6b
Cr-Commit-Position: refs/heads/master@{#299248}