Revert of Telemetry, Mac: Use the actual keychain for performance tests.

Revert of Telemetry, Mac: Use the actual keychain for performance tests. (patchset #1 id:1 of https://codereview.chromium.org/419133002/)

Reason for revert:
Bots need to have their configs updated before this CL can land.

Original issue's description:
> Telemetry, Mac: Use the actual keychain for performance tests.
>
> The real keychain was stubbed out because it was causing problems
> with page cyclers on 10.9 perf bots.
> https://codereview.chromium.org/176583002
>
> This is problematic because it prevents us from catching real performance
> regressions involving the keychain.
> https://code.google.com/p/chromium/issues/detail?id=397308
>
> Rather than disabling keychain interactions altogether, we should fix the 10.9
> page cycler problems. I added a wiki page describing the correct configuration
> for the keychain on Macs.
> https://sites.google.com/a/chromium.org/dev/developers/telemetry/telemetry-mac-keychain-setup
>
> This change will cause a serious performance regression for the telemetry test
> session_restore, and possibly others, since Chrome does not interact well with
> the keychain. See the associated bug. Note that this regression reflects
> accurate user conditions, and that the current performance statistics are
> artifically lowered by stubbing out keychain interactions.
>
> BUG=397308
>
> Committed: https://crrev.com/e38f0dad2e9bdccfaa900e9c2bda2a6e61d85c8b
> Cr-Commit-Position: refs/heads/master@{#302917}

TBR=tonyg@chromium.org,oysteine@chromium.org,jeremy@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=397308
Committed: https://crrev.com/ba614dbec9638745a84f13bd15215d4fab00bf9d
Cr-Commit-Position: refs/heads/master@{#303057}

[erikchen, 2014-11-06 18:55:51]

Created Revert of Telemetry, Mac: Use the actual keychain for performance tests.

[commit-bot: I haz the power, 2014-11-06 18:57:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/681113009/1

[commit-bot: I haz the power, 2014-11-06 18:58:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-06 18:59:04]

Patchset 1 (id:??) landed as
https://crrev.com/ba614dbec9638745a84f13bd15215d4fab00bf9d
Cr-Commit-Position: refs/heads/master@{#303057}