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:
Broke content_browsertests, preventing Blink from rolling. 3 tests failed:
    DevToolsAgentTest.DevToolsResumeOnClose
    V8SamplingProfilerTest.V8SamplingJitCodeEventsCollected
    V8SamplingProfilerTest.V8SamplingSamplesCollected

See, for example:
    http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_rel_ng/builds/60276

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

TBR=oilpan-reviews@chromium.org,sigbjornf@opera.com,haraken@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=480837
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=194812

[jbroman, 2015-05-01 16:59:47]

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

[commit-bot: I haz the power, 2015-05-01 17:00:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1123443002/1

[commit-bot: I haz the power, 2015-05-01 17:00:56]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=194812

[sof, 2015-05-01 18:07:25]

lgtm, thanks for the help.

[haraken, 2015-05-02 02:29:05]

LGTM, thanks for the revert!