Revert of Fix PRESUBMIT.py after disabling CQ.

Revert of Fix PRESUBMIT.py after disabling CQ. (patchset #1 id:1 of https://codereview.webrtc.org/1192673003/)

Reason for revert:
CQ-Rietveld combination now supports webrtc custom domain.

Original issue's description:
> Fix PRESUBMIT.py after disabling CQ.
>
> The disabling of CQ in https://codereview.webrtc.org/1177243003/
> broke PRESUBMIT.py since it's trying to read cq.cfg.
>
> BUG=501332
> TBR=phoglund@webrtc.org
>
> Committed: https://chromium.googlesource.com/external/webrtc/+/141725f50fa4223ce2f9e84500971a44d7720c03

TBR=phoglund@webrtc.org,kjellander@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=501332
Committed: https://crrev.com/04465d286e6a1a643c88fabddd44eb870f906c38
Cr-Commit-Position: refs/heads/master@{#9476}

[tandrii(chromium), 2015-06-19 11:59:18]

Created Revert of Fix PRESUBMIT.py after disabling CQ.

[kjellander_webrtc, 2015-06-20 10:53:50]

lgtm

[kjellander_webrtc, 2015-06-20 10:54:08]

The CQ bit was unchecked by kjellander@webrtc.org

[kjellander_webrtc, 2015-06-20 10:54:10]

The CQ bit was checked by kjellander@webrtc.org

[commit-bot: I haz the power, 2015-06-20 11:00:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1190283003/1

[commit-bot: I haz the power, 2015-06-20 11:00:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-20 11:01:05]

Patchset 1 (id:??) landed as
https://crrev.com/04465d286e6a1a643c88fabddd44eb870f906c38
Cr-Commit-Position: refs/heads/master@{#9476}