Revert 174382 "Oilpan: make DocumentFragment a heap allocated ob..."

Revert 174382 "Oilpan: make DocumentFragment a heap allocated ob..."

Suspect this caused assertion failures in inspector/split-view.html,
which may indicate a deeper problem. See Issue 357163.

> Oilpan: make DocumentFragment a heap allocated object.
> 
> R=wibling@chromium.org,zerny@chromium.org,haraken@chromium.org
> BUG=357163
> 
> Review URL: https://codereview.chromium.org/289273002

TBR=sigbjornf@opera.com

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=174396

[Ken Russell (switch to Gerrit), 2014-05-20 18:51:42]

Committed patchset #1 manually as r174396.

[sof, 2014-05-20 21:46:24]

On 2014/05/20 18:51:42, Ken Russell wrote:
> Committed patchset #1 manually as r174396.

thanks, lgtm. will investigate in the morning, but i can repro the failure with
or without this CL.

[Ken Russell (switch to Gerrit), 2014-05-20 22:16:58]

On 2014/05/20 21:46:24, sof wrote:
> On 2014/05/20 18:51:42, Ken Russell wrote:
> > Committed patchset #1 manually as r174396.
> 
> thanks, lgtm. will investigate in the morning, but i can repro the failure
with
> or without this CL.

Apologies, I see the test is still asserting even after this revert in
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20%28dbg%...
. I'm continuing to investigate. Can you take care of re-landing your CL?