Disabling appcontainer to get baseline for sandboxed process launch errors.

Disabling appcontainer to get baseline for sandboxed process launch errors.
We already have metrics to track lowbox process launch errors, but no metrics to track sandboxed process launch errors in general.
The CL (https://codereview.chromium.org/1040223002/) will address that.

BUG=455496
R=cpu@chromium.org,ananta@chromium.org,jschuh@chromium.org

Committed: https://crrev.com/fdf0832bcd0deb3a58bacc43b0db8755d84546d1
Cr-Commit-Position: refs/heads/master@{#323345}

[cpu_(ooo_6.6-7.5), 2015-03-31 23:43:50]

lgtm

I CQ'd your other changed. I don't know what order you want.

[Shrikant Kelkar, 2015-04-01 00:15:02]

On 2015/03/31 23:43:50, cpu wrote:
> lgtm
> 
> I CQ'd your other changed. I don't know what order you want.

Any order should be fine. Thanks.

[Shrikant Kelkar, 2015-04-01 21:13:29]

The CQ bit was checked by shrikant@chromium.org

[commit-bot: I haz the power, 2015-04-01 21:14:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1046913004/1

[commit-bot: I haz the power, 2015-04-01 22:27:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-01 22:28:46]

Patchset 1 (id:??) landed as
https://crrev.com/fdf0832bcd0deb3a58bacc43b0db8755d84546d1
Cr-Commit-Position: refs/heads/master@{#323345}