Update code related to OOM errors in sanitizer builds.

Update code related to OOM errors in sanitizer builds.

Remove outdated comment and enable OOM tests under sanitizers. Also, document
the fact that the newly introduced UncheckedMalloc()/UncheckedCalloc() don't
work as intended in sanitizer builds.

BUG=357732
R=thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260379

[earthdok, 2014-03-28 19:31:32]

Please take a look.

[Nico, 2014-03-28 19:34:52]

lgtm

[kbalazs, 2014-03-28 20:06:08]

On 2014/03/28 19:34:52, Nico wrote:
> lgtm

Thanks for the cleanup!

[earthdok, 2014-03-28 22:38:44]

The CQ bit was checked by earthdok@chromium.org

[commit-bot: I haz the power, 2014-03-28 22:49:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/earthdok@chromium.org/217343002/1

[commit-bot: I haz the power, 2014-03-29 00:28:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-29 00:28:06]

Try jobs failed on following builders:
  tryserver.chromium on linux_chromium_chromeos_rel

[earthdok, 2014-03-29 10:02:44]

The CQ bit was checked by earthdok@chromium.org

[commit-bot: I haz the power, 2014-03-29 10:03:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/earthdok@chromium.org/217343002/1

[commit-bot: I haz the power, 2014-03-29 17:30:41]

Change committed as 260379