Revert of Oilpan: Rename heap classes

Revert of Oilpan: Rename heap classes (patchset #3 id:40001 of https://codereview.chromium.org/906213002/)

Reason for revert:
This is on top of https://codereview.chromium.org/907943002/ which needs to be reverted due to lots of browser test failures.

Original issue's description:
> Oilpan: Rename heap classes
> 
> This CL renames heap classes as follows to make the naming more consistent
> 
> [Before]
> BaseHeapPage <-- HeapPage, LargeObject
> ThreadHeap <-- ThreadHeapForHeapPage, ThreadHeapForLargeObject
> 
> [After]
> BasePage <-- NormalPage, LargeObjectPage
> BasePageHeap <-- NormalPageHeap, LargeObjectHeap
> 
> Also this CL renames enum values of TypedHeaps (to avoid conflict with "LargeObjectHeap").
> 
> BUG=420515
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=189806

TBR=oilpan-reviews@chromium.org,sigbjornf@opera.com,haraken@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=420515
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=189826

[caseq, 2015-02-09 18:34:40]

Created Revert of Oilpan: Rename heap classes

[commit-bot: I haz the power, 2015-02-09 18:35:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/911663002/1

[commit-bot: I haz the power, 2015-02-09 18:36:00]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=189826

[sof, 2015-02-09 18:44:30]

lgtm

[haraken, 2015-02-10 01:03:44]

LGTM