Add 24000KHz support to the uma stat

Add 24000KHz support to the uma stat.

https://codereview.chromium.org/554733002 added support to 24K as sample rate, we need to update the uma stat correspondingly.

BUG=411241
Committed: https://crrev.com/47c9f2e6ee40364cd2720c1e01f1bd3dc475ce78
Cr-Commit-Position: refs/heads/master@{#296419}

[no longer working on chromium, 2014-09-24 11:12:41]

xians@chromium.org changed reviewers:
+ asvitkine@chromium.org

[no longer working on chromium, 2014-09-24 11:13:05]

Alexei, please review this trivial fix.

Thanks,
SX

[Alexei Svitkine (slow), 2014-09-24 14:43:12]

LGTM

In the future, it would be better to do it in the same CL.

[no longer working on chromium, 2014-09-24 14:46:45]

The CQ bit was checked by xians@chromium.org

[commit-bot: I haz the power, 2014-09-24 14:47:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/602503003/1

[no longer working on chromium, 2014-09-24 14:47:31]

On 2014/09/24 14:43:12, Alexei Svitkine wrote:
> LGTM
> 
> In the future, it would be better to do it in the same CL.

Thanks. Got it, we forgot changing the xml, sorry for the mistake.

[commit-bot: I haz the power, 2014-09-24 15:37:24]

Committed patchset #1 (id:1) as 26b30ada03e7220d8ae1accb2b56511ff6d93e9b

[commit-bot: I haz the power, 2014-09-24 15:38:05]

Patchset 1 (id:??) landed as
https://crrev.com/47c9f2e6ee40364cd2720c1e01f1bd3dc475ce78
Cr-Commit-Position: refs/heads/master@{#296419}