Revert of [heap] Cancel tasks before tearing down the heap.

Revert of [heap] Cancel tasks before tearing down the heap. (patchset #2 id:20001 of https://codereview.chromium.org/2413203004/ )

Reason for revert:
Timeout on gc stress bot.

Original issue's description:
> [heap] Cancel tasks before tearing down the heap.
>
> BUG=chromium:654343
>
> Committed: https://crrev.com/9365463d6f1fc11b2369fff63ca0ac825c61eae4
> Cr-Commit-Position: refs/heads/master@{#40272}

TBR=mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:654343
Committed: https://crrev.com/f0c3a2523def5c5aebf330b870776021ccf3c409
Cr-Commit-Position: refs/heads/master@{#40279}

[ulan, 2016-10-13 16:16:14]

The CQ bit was checked by ulan@chromium.org

[ulan, 2016-10-13 16:16:14]

Created Revert of [heap] Cancel tasks before tearing down the heap.

[commit-bot: I haz the power, 2016-10-13 16:16:20]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-13 16:16:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-13 16:16:55]

Description was changed from

==========
Revert of [heap] Cancel tasks before tearing down the heap. (patchset #2
id:20001 of https://codereview.chromium.org/2413203004/ )

Reason for revert:
Timeout on gc stress bot.

Original issue's description:
> [heap] Cancel tasks before tearing down the heap.
> 
> BUG=chromium:654343
> 
> Committed: https://crrev.com/9365463d6f1fc11b2369fff63ca0ac825c61eae4
> Cr-Commit-Position: refs/heads/master@{#40272}

TBR=mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:654343
==========

to

==========
Revert of [heap] Cancel tasks before tearing down the heap. (patchset #2
id:20001 of https://codereview.chromium.org/2413203004/ )

Reason for revert:
Timeout on gc stress bot.

Original issue's description:
> [heap] Cancel tasks before tearing down the heap.
>
> BUG=chromium:654343
>
> Committed: https://crrev.com/9365463d6f1fc11b2369fff63ca0ac825c61eae4
> Cr-Commit-Position: refs/heads/master@{#40272}

TBR=mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:654343

Committed: https://crrev.com/f0c3a2523def5c5aebf330b870776021ccf3c409
Cr-Commit-Position: refs/heads/master@{#40279}
==========

[commit-bot: I haz the power, 2016-10-13 16:16:56]

Patchset 1 (id:??) landed as
https://crrev.com/f0c3a2523def5c5aebf330b870776021ccf3c409
Cr-Commit-Position: refs/heads/master@{#40279}