Wait for cancelable task after tearing down the heap.

Wait for cancelable task after tearing down the heap.

BUG=

Committed: https://crrev.com/eb8a42383c756858519d6c3c08be8e0898bee357
Cr-Commit-Position: refs/heads/master@{#32093}

[Michael Lippautz, 2015-11-18 17:14:27]

The CQ bit was checked by mlippautz@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-18 17:14:33]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1462573002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1462573002/1

[payer, 2015-11-18 17:16:06]

hpayer@google.com changed reviewers:
+ hpayer@google.com

[payer, 2015-11-18 17:16:07]

lgtm

[Hannes Payer (out of office), 2015-11-18 17:17:07]

hpayer@chromium.org changed reviewers:
+ hpayer@chromium.org

[Hannes Payer (out of office), 2015-11-18 17:17:07]

lgtm

[commit-bot: I haz the power, 2015-11-18 17:34:58]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-18 17:34:59]

Dry run: This issue passed the CQ dry run.

[Michael Lippautz, 2015-11-18 17:35:38]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2015-11-18 17:35:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1462573002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1462573002/1

[commit-bot: I haz the power, 2015-11-18 17:36:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-18 17:37:37]

Patchset 1 (id:??) landed as
https://crrev.com/eb8a42383c756858519d6c3c08be8e0898bee357
Cr-Commit-Position: refs/heads/master@{#32093}