Revert of Make linux_chromium_clobber_rel_ng experimental

Revert of Make linux_chromium_clobber_rel_ng experimental (patchset #1 id:1 of https://codereview.chromium.org/1403443004/ )

Reason for revert:
Having a bot that mirrors clobber bot on FYI waterfall is better than having nothing.

Original issue's description:
> Make linux_chromium_clobber_rel_ng experimental
>
> This is needed to avoid tree breakages before making it mirror Linux GN Clobber.
> Since currently, linux_chromium_clobber_rel_ng is mirroring a bot on FYI
> waterfal it is not useful in CQ anyway.
>
> R=phajdan.jr@chromium.org
> BUG=531296
>
> Committed: https://crrev.com/7ff7bb3be8f97dbcb1ed7e225fb7acdef15c3cc1
> Cr-Commit-Position: refs/heads/master@{#354241}

TBR=phajdan.jr@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=531296
Committed: https://crrev.com/2378a605285519acc04b79ec04be08bc3fea39f5
Cr-Commit-Position: refs/heads/master@{#355042}

[Sergiy Byelozyorov, 2015-10-20 12:02:16]

Created Revert of Make linux_chromium_clobber_rel_ng experimental

[commit-bot: I haz the power, 2015-10-20 12:02:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1420503003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1420503003/1

[commit-bot: I haz the power, 2015-10-20 12:03:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-20 12:05:15]

Patchset 1 (id:??) landed as
https://crrev.com/2378a605285519acc04b79ec04be08bc3fea39f5
Cr-Commit-Position: refs/heads/master@{#355042}