Revert of Oilpan: Enable lazy sweeping on non-oilpan builds

Revert of Oilpan: Enable lazy sweeping on non-oilpan builds (patchset #2 id:20001 of https://codereview.chromium.org/1055193004/)

Reason for revert:
The use of lazy sweeping appears to be behind this ASan regression,

 https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Linux_ASAN/18437/layout-test-results/http/tests/serviceworker/fetch-canvas-tainting-crash-log.txt

i.e., it risks lifecycle notification touching already finalized & freed objects.

Original issue's description:
> Oilpan: Enable lazy sweeping on non-oilpan builds
> 
> Currently lazy sweeping is enabled only on oilpan builds. Since the lazy sweeping has been stable on the oilpan builds for >3 months, I think it's now safe to enable it on non-oilpan builds as well.
> 
> BUG=480837
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=194808
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195022

TBR=oilpan-reviews@chromium.org,haraken@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=480837
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195067

[sof, 2015-05-07 18:07:30]

Created Revert of Oilpan: Enable lazy sweeping on non-oilpan builds

[commit-bot: I haz the power, 2015-05-07 18:08:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133563004/1

[commit-bot: I haz the power, 2015-05-07 18:08:42]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195067

[sof, 2015-05-07 18:09:12]

https://groups.google.com/a/chromium.org/forum/#!topic/oilpan-reviews/u3dax9m...
has more context.

[haraken, 2015-05-07 23:42:44]

On 2015/05/07 18:09:12, sof wrote:
>
https://groups.google.com/a/chromium.org/forum/#!topic/oilpan-reviews/u3dax9m...
> has more context.

LGTM, thanks for the investigation!