Revert of Experiment: reduce heap growing factor to investigate OOM impact.

Revert of Experiment: reduce heap growing factor to investigate OOM impact. (patchset #4 id:60001 of https://codereview.chromium.org/1060533003/)

Reason for revert:
Experiment done.

Original issue's description:
> Experiment: reduce heap growing factor to investigate OOM impact.
>
> This CL will be reverted after getting sufficient data.
> BUG=
>
> Committed: https://crrev.com/8b737395c8fcde35cbfbed6607f767ed48eefc5b
> Cr-Commit-Position: refs/heads/master@{#27804}

TBR=ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/bbd222f88236db0a555d93c7df8495c8a135906a
Cr-Commit-Position: refs/heads/master@{#27871}

[Hannes Payer (out of office), 2015-04-16 09:06:27]

Created Revert of Experiment: reduce heap growing factor to investigate OOM
impact.

[commit-bot: I haz the power, 2015-04-16 09:06:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085353003/1

[commit-bot: I haz the power, 2015-04-16 09:06:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 09:07:07]

Patchset 1 (id:??) landed as
https://crrev.com/bbd222f88236db0a555d93c7df8495c8a135906a
Cr-Commit-Position: refs/heads/master@{#27871}

[ulan, 2015-04-16 09:07:49]

lgtm