Revert of Oilpan: Remove duplicated code between HeapPage and LargeObject

Revert of Oilpan: Remove duplicated code between HeapPage and LargeObject (patchset #11 id:200001 of https://codereview.chromium.org/840223002/)

Reason for revert:
This change is being blamed for win_chromium_x64_rel_ng failures that are blocking the blink roll. See http://crbug.com/457808 for details.

Original issue's description:
> Oilpan: Remove duplicated code between HeapPage and LargeObject
> 
> Basically, this CL changes:
> 
> class ThreadHeap {
>   ...; // Methods for both HeapPages and LargeObjects
>   HeapPage* m_firstPage;
>   LargeObject* m_firstLargeObject;
> };
> 
> to:
> 
> class ThreadHeap {
>   ...;  // Common methods between HeapPages and LargeObjects.
>   BaseHeapPage* m_firstPage;
> };
> class ThreadHeapForHeapPage {  ...; // Methods for HeapPages. }
> class TheadHeapForLargeObject { ...; // Methods for LargeObjects. }
> 
> and thus remove various duplicated code between HeapPage and LargeObject. To achieve the goal, this CL creates a dedicated ThreadHeap for LargeObjects (i.e., LargeObjectHeap).
> 
> BUG=446386
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=189782
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=189953

TBR=oilpan-reviews@chromium.org,sigbjornf@opera.com,haraken@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=446386
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=189981

[pdr., 2015-02-11 21:30:15]

Created Revert of Oilpan: Remove duplicated code between HeapPage and
LargeObject

[commit-bot: I haz the power, 2015-02-11 21:32:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/921493003/1

[commit-bot: I haz the power, 2015-02-11 21:37:26]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=189981

[haraken, 2015-02-12 01:00:56]

On 2015/02/11 21:37:26, I haz the power (commit-bot) wrote:
> Committed patchset #1 (id:1) as
> https://src.chromium.org/viewvc/blink?view=rev&revision=189981

Thanks for taking care of this. I guess this CL won't be the culprit, but let me
test the win_chromium_x64_rel_ng bot before relanding. LGTM.