Revert of [heap] Refactor evacuation for young and old gen into visitors.

Revert of [heap] Refactor evacuation for young and old gen into visitors. (patchset #5 id:80001 of https://codereview.chromium.org/1470253002/ )

Reason for revert:
Still investigating bad canary.

Original issue's description:
> [heap] Refactor evacuation for young and old gen into visitors.
>
> Create a visitor for evacuating objects for young and old generation. This is
> the first step of preparing a task to process, both,  newspace and oldspace
> pages in parallel.
>
> BUG=chromium:524425
> LOG=N
>
> Committed: https://crrev.com/138d9bae5d7014e0d205634a49b5eac3697744c8
> Cr-Commit-Position: refs/heads/master@{#32349}

TBR=mlippautz@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425
Committed: https://crrev.com/aa24a3135ec308e1f84bce334844caf0cae2437a
Cr-Commit-Position: refs/heads/master@{#32462}

[Hannes Payer (out of office), 2015-12-01 13:29:59]

Created Revert of [heap] Refactor evacuation for young and old gen into
visitors.

[commit-bot: I haz the power, 2015-12-01 13:30:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1483393002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1483393002/1

[commit-bot: I haz the power, 2015-12-01 13:30:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-01 13:31:26]

Description was changed from

==========
Revert of [heap] Refactor evacuation for young and old gen into visitors.
(patchset #5 id:80001 of https://codereview.chromium.org/1470253002/ )

Reason for revert:
Still investigating bad canary.

Original issue's description:
> [heap] Refactor evacuation for young and old gen into visitors.
> 
> Create a visitor for evacuating objects for young and old generation. This is
> the first step of preparing a task to process, both,  newspace and oldspace
> pages in parallel.
> 
> BUG=chromium:524425
> LOG=N
> 
> Committed: https://crrev.com/138d9bae5d7014e0d205634a49b5eac3697744c8
> Cr-Commit-Position: refs/heads/master@{#32349}

TBR=mlippautz@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425
==========

to

==========
Revert of [heap] Refactor evacuation for young and old gen into visitors.
(patchset #5 id:80001 of https://codereview.chromium.org/1470253002/ )

Reason for revert:
Still investigating bad canary.

Original issue's description:
> [heap] Refactor evacuation for young and old gen into visitors.
>
> Create a visitor for evacuating objects for young and old generation. This is
> the first step of preparing a task to process, both,  newspace and oldspace
> pages in parallel.
>
> BUG=chromium:524425
> LOG=N
>
> Committed: https://crrev.com/138d9bae5d7014e0d205634a49b5eac3697744c8
> Cr-Commit-Position: refs/heads/master@{#32349}

TBR=mlippautz@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425

Committed: https://crrev.com/aa24a3135ec308e1f84bce334844caf0cae2437a
Cr-Commit-Position: refs/heads/master@{#32462}
==========

[commit-bot: I haz the power, 2015-12-01 13:31:27]

Patchset 1 (id:??) landed as
https://crrev.com/aa24a3135ec308e1f84bce334844caf0cae2437a
Cr-Commit-Position: refs/heads/master@{#32462}

[Hannes Payer (out of office), 2015-12-02 11:02:53]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1493523003/ by hpayer@chromium.org.

The reason for reverting is: Reland after fixing the potential root cause of the
canary crasher..