Revert of Avoid excessive GCs in small heaps.

Revert of Avoid excessive GCs in small heaps. (patchset #1 id:1 of https://codereview.chromium.org/1144223002/)

Reason for revert:
Regressed Sunspider.

Original issue's description:
> Avoid excessive GCs in small heaps.
>
> Small heaps and small heap growing factor can lead to excessive GCs in corner cases.
>
> Consider function F(old_gen_size, factor) that returns the number of bytes that
> have to be allocated in the old generation to start incremental marking.
>
> F(4MB, 1.1) = 4MB (because of kMinimumOldGenerationAllocationLimit)
> F(6MB, 1.1) = 2MB (because of kMinimumOldGenerationAllocationLimit)
> F(8MB, 1.1) = 800KB
>
> Funtion F should be monotonic in old_gen_size, but it currently has a minimum
> at kMinimumOldGenerationAllocationLimit.
>
> This CL makes F monotonic.
>
> BUG=
>
> Committed: https://crrev.com/22b1da99732b4db0754bf267ec470a2831216fb2
> Cr-Commit-Position: refs/heads/master@{#28549}

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

Committed: https://crrev.com/e8c593c4f826480861f973b59cc596fb7a88f2d8
Cr-Commit-Position: refs/heads/master@{#28558}

[ulan, 2015-05-21 14:46:54]

Created Revert of Avoid excessive GCs in small heaps.

[commit-bot: I haz the power, 2015-05-21 14:47:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1152533002/1

[commit-bot: I haz the power, 2015-05-21 14:47:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-21 14:47:42]

Patchset 1 (id:??) landed as
https://crrev.com/e8c593c4f826480861f973b59cc596fb7a88f2d8
Cr-Commit-Position: refs/heads/master@{#28558}