Revert of Oilpan: Enable idle GCs on non-oilpan builds (patchset #2 id:20001 of https://codereview.chromium.org/1210963005/)
Revert of Oilpan: Enable idle GCs on non-oilpan builds (patchset #2 id:20001 of https://codereview.chromium.org/1210963005/)

Reason for revert:
Seems to break telemetry_perf_unittests.

Original issue's description:
> Oilpan: Enable idle GCs on non-oilpan builds
> 
> The behavior of idle GCs has been stabilized on oilpan builds.
> It seems safe to enable it on non-oilpan builds.
> 
> BUG=480837
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198258

TBR=oilpan-reviews@chromium.org,yutak@chromium.org,haraken@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=480837

Review URL: https://codereview.chromium.org/1220633004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@198282 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk