Revert of [heap] Uncommit unused large object page memory.

Revert of [heap] Uncommit unused large object page memory. (patchset #13 id:230001 of https://codereview.chromium.org/2032393002/ )

Reason for revert:
Needs fixing of slot set.

Original issue's description:
> [heap] Uncommit unused large object page memory.
>
> As a first step I uncommit the memory on the main thread. Also to measure impact and stability of that optimization. In a follow-up CL, the uncommitting should be moved on the concurrent thread.
>
> BUG=
>
> Committed: https://crrev.com/d61a5c376ba51145dc4684e39d5d3a9ce75bcfa6
> Cr-Commit-Position: refs/heads/master@{#36763}

TBR=ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/1e3a38d9624b8f9e4a8a4e084848e933f55ff647
Cr-Commit-Position: refs/heads/master@{#36807}

[Hannes Payer (out of office), 2016-06-08 06:12:39]

The CQ bit was checked by hpayer@chromium.org

[Hannes Payer (out of office), 2016-06-08 06:12:40]

Created Revert of [heap] Uncommit unused large object page memory.

[commit-bot: I haz the power, 2016-06-08 06:12:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2043263002/1

[commit-bot: I haz the power, 2016-06-08 06:52:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-08 06:53:40]

Description was changed from

==========
Revert of [heap] Uncommit unused large object page memory. (patchset #13
id:230001 of https://codereview.chromium.org/2032393002/ )

Reason for revert:
Needs fixing of slot set.

Original issue's description:
> [heap] Uncommit unused large object page memory.
> 
> As a first step I uncommit the memory on the main thread. Also to measure
impact and stability of that optimization. In a follow-up CL, the uncommitting
should be moved on the concurrent thread.
> 
> BUG=
> 
> Committed: https://crrev.com/d61a5c376ba51145dc4684e39d5d3a9ce75bcfa6
> Cr-Commit-Position: refs/heads/master@{#36763}

TBR=ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=
==========

to

==========
Revert of [heap] Uncommit unused large object page memory. (patchset #13
id:230001 of https://codereview.chromium.org/2032393002/ )

Reason for revert:
Needs fixing of slot set.

Original issue's description:
> [heap] Uncommit unused large object page memory.
>
> As a first step I uncommit the memory on the main thread. Also to measure
impact and stability of that optimization. In a follow-up CL, the uncommitting
should be moved on the concurrent thread.
>
> BUG=
>
> Committed: https://crrev.com/d61a5c376ba51145dc4684e39d5d3a9ce75bcfa6
> Cr-Commit-Position: refs/heads/master@{#36763}

TBR=ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/1e3a38d9624b8f9e4a8a4e084848e933f55ff647
Cr-Commit-Position: refs/heads/master@{#36807}
==========

[commit-bot: I haz the power, 2016-06-08 06:53:41]

Patchset 1 (id:??) landed as
https://crrev.com/1e3a38d9624b8f9e4a8a4e084848e933f55ff647
Cr-Commit-Position: refs/heads/master@{#36807}