Revert of Conv CHECK->DCHECK in CloseHandle (top crasher & data enough to debug)

Revert of Conv CHECK->DCHECK in CloseHandle (top crasher & data enough to debug) (patchset #2 id:20001 of https://codereview.chromium.org/1108953003/)

Reason for revert:
rvargas said so.

Original issue's description:
> Conv CHECK->DCHECK in CloseHandle (top crasher & data enough to debug)
> We seem to have gathered enough data to find out debug further cause/reason for calling CloseHandle on already closed/invalid handle.
> There are couple of theories which need to be investigated further like policy ownership of TargetProcess and thread watching for JOB_OBJECT_MSG_ACTIVE_PROCESS_ZERO.
> CHECK seem to have introduced with CL https://codereview.chromium.org/1045513004
>
> BUG=480639
> R=cpu@chromium.org,grt@chromium.org
>
> Committed: https://crrev.com/dfb73a76e24eadbb2311c7b756c0383acefc8f06
> Cr-Commit-Position: refs/heads/master@{#327348}

TBR=cpu@chromium.org,rvargas@chromium.org,shrikant@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=480639
Committed: https://crrev.com/bd7754c1ce9c6d95d18b44de8ff424417af3890a
Cr-Commit-Position: refs/heads/master@{#327643}

[grt (UTC plus 2), 2015-04-30 02:46:39]

Created Revert of Conv CHECK->DCHECK in CloseHandle (top crasher & data enough
to debug)

[commit-bot: I haz the power, 2015-04-30 02:47:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1109423003/1

[commit-bot: I haz the power, 2015-04-30 02:47:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-30 02:48:40]

Patchset 1 (id:??) landed as
https://crrev.com/bd7754c1ce9c6d95d18b44de8ff424417af3890a
Cr-Commit-Position: refs/heads/master@{#327643}