Revert of Make ios CQ builders experimental.

Revert of Make ios CQ builders experimental. (patchset #1 id:1 of https://codereview.chromium.org/1426303002/ )

Reason for revert:
The tree is closed, anyway, so this builder is not blocking CLs from landing.

Original issue's description:
> Make ios CQ builders experimental.
>
> Most of the slaves are offline, so as a temporary measure
> make the builders a 10% experiment.
>
> BUG=550805
> NOTRY=True
>
> Committed: https://crrev.com/19fec167b31487670bd1f15ded6c86f3eb57bdcf
> Cr-Commit-Position: refs/heads/master@{#357539}

TBR=phajdan.jr@chromium.org,machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=550805
Committed: https://crrev.com/b48561266630f4f964f424d597736bd9c6f1eaa0
Cr-Commit-Position: refs/heads/master@{#357543}

[Adrian Kuegel, 2015-11-03 16:23:30]

Created Revert of Make ios CQ builders experimental.

[commit-bot: I haz the power, 2015-11-03 16:23:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1425413002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1425413002/1

[commit-bot: I haz the power, 2015-11-03 16:25:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-03 16:26:11]

Patchset 1 (id:??) landed as
https://crrev.com/b48561266630f4f964f424d597736bd9c6f1eaa0
Cr-Commit-Position: refs/heads/master@{#357543}