Revert of [Oilpan] Migrate classes under module/webgl onto oilpan heap

Revert of [Oilpan] Migrate classes under module/webgl onto oilpan heap (patchset #13 id:240001 of https://codereview.chromium.org/1234883002/ )

Reason for revert:
This caused blink-gc plugin errors on all Win/Clang builders. See e.g. http://build.chromium.org/p/chromium.fyi/builders/ClangToTWin/builds/2402

Original issue's description:
> [Oilpan] Migrate classes under module/webgl onto oilpan heap
> 
> 
> Following document reports the effect of this CL on performance and memory usages.
> https://docs.google.com/document/d/1QUDGL5a2wBZVyUrzlGjzKFe1sQgOOvm6gNhB1B7VRoE/edit?usp=sharing
> 
> 
> BUG=497662
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200298

TBR=oilpan-reviews@chromium.org,kbr@chromium.org,bajones@chromium.org,junov@chromium.org,zmo@chromium.org,sigbjornf@opera.com,haraken@chromium.org,peria@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=497662
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200321

[hans, 2015-08-11 15:43:30]

Created Revert of [Oilpan] Migrate classes under module/webgl onto oilpan heap

[commit-bot: I haz the power, 2015-08-11 15:43:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1281953003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1281953003/1

[haraken, 2015-08-11 15:45:17]

LGTM

[commit-bot: I haz the power, 2015-08-11 15:45:24]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200321