Make test unthreaded so other tests don't interfere with heap size

Make test unthreaded so other tests don't interfere with heap size

R=hpayer@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/a0e2dd23cea916eddc9c946f30966e73b217a4f5
Cr-Commit-Position: refs/heads/master@{#27890}

[Yang, 2015-04-16 14:42:01]

On 2015/04/16 14:40:05, Erik Corry Chromium.org wrote:

Lgtm

[Erik Corry Chromium.org, 2015-04-16 14:42:55]

The CQ bit was checked by erikcorry@chromium.org

[commit-bot: I haz the power, 2015-04-16 14:43:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1086423003/1

[commit-bot: I haz the power, 2015-04-16 14:44:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 14:44:48]

Patchset 1 (id:??) landed as
https://crrev.com/a0e2dd23cea916eddc9c946f30966e73b217a4f5
Cr-Commit-Position: refs/heads/master@{#27890}

[titzer, 2015-04-17 09:59:57]

On 2015/04/16 14:40:05, Erik Corry Chromium.org wrote:

What's the point of this change? Does it somehow depend on the heap size being
stable?

IMO this change only reduces test coverage. It would be better to copy the test
and run it in both threaded and unthreaded modes.