Revert of Disable page navigation GC

Revert of Disable page navigation GC (patchset #5 id:80001 of https://codereview.chromium.org/1698703002/ )

Reason for revert:
Caused some unintended perf regressions.

Original issue's description:
> Disable page navigation GC
>
> Page navigation GC is firing too much in some circumstances. This CL disables it to observe impact.
>
> BUG=588029
>
> Committed: https://crrev.com/6ee2be06467613d8770c041a30e123cc23d8e752
> Cr-Commit-Position: refs/heads/master@{#376385}

TBR=oilpan-reviews@chromium.org,haraken@chromium.org,sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=588029
Committed: https://crrev.com/7e7bfd6d94de0fbdef0744d98d73f8d2410f1821
Cr-Commit-Position: refs/heads/master@{#378445}

[keishi, 2016-03-01 13:50:15]

Created Revert of Disable page navigation GC

[commit-bot: I haz the power, 2016-03-01 13:50:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1750993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1750993002/1

[commit-bot: I haz the power, 2016-03-01 14:01:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1750993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1750993002/1

[commit-bot: I haz the power, 2016-03-01 14:31:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1750993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1750993002/1

[commit-bot: I haz the power, 2016-03-01 15:01:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1750993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1750993002/1

[sof, 2016-03-01 15:06:27]

lgtm

[haraken, 2016-03-01 15:28:43]

LGTM

[commit-bot: I haz the power, 2016-03-01 15:31:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1750993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1750993002/1

[commit-bot: I haz the power, 2016-03-01 16:01:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1750993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1750993002/1

[commit-bot: I haz the power, 2016-03-01 16:16:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-01 16:18:56]

Description was changed from

==========
Revert of Disable page navigation GC (patchset #5 id:80001 of
https://codereview.chromium.org/1698703002/ )

Reason for revert:
Caused some unintended perf regressions.

Original issue's description:
> Disable page navigation GC
> 
> Page navigation GC is firing too much in some circumstances. This CL disables
it to observe impact.
> 
> BUG=588029
> 
> Committed: https://crrev.com/6ee2be06467613d8770c041a30e123cc23d8e752
> Cr-Commit-Position: refs/heads/master@{#376385}

TBR=oilpan-reviews@chromium.org,haraken@chromium.org,sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=588029
==========

to

==========
Revert of Disable page navigation GC (patchset #5 id:80001 of
https://codereview.chromium.org/1698703002/ )

Reason for revert:
Caused some unintended perf regressions.

Original issue's description:
> Disable page navigation GC
>
> Page navigation GC is firing too much in some circumstances. This CL disables
it to observe impact.
>
> BUG=588029
>
> Committed: https://crrev.com/6ee2be06467613d8770c041a30e123cc23d8e752
> Cr-Commit-Position: refs/heads/master@{#376385}

TBR=oilpan-reviews@chromium.org,haraken@chromium.org,sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=588029

Committed: https://crrev.com/7e7bfd6d94de0fbdef0744d98d73f8d2410f1821
Cr-Commit-Position: refs/heads/master@{#378445}
==========

[commit-bot: I haz the power, 2016-03-01 16:18:57]

Patchset 1 (id:??) landed as
https://crrev.com/7e7bfd6d94de0fbdef0744d98d73f8d2410f1821
Cr-Commit-Position: refs/heads/master@{#378445}

[haraken, 2016-03-03 02:08:20]

I'd prioritize fixing the page navigation GCs rather than per-thread heaps.