Fix vcall on nullptr in ~Performance.

Fix vcall on nullptr in ~Performance.

This is a follow up to https://codereview.chromium.org/2449673002/

BUG=607996
Committed: https://crrev.com/ebf0e626c43b986e5dfed5e961575bf31760a11c
Cr-Commit-Position: refs/heads/master@{#429409}

[krasin1, 2016-11-02 20:14:34]

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

[krasin1, 2016-11-02 20:14:59]

krasin@chromium.org changed reviewers:
+ caseq@chromium.org, dgozman@chromium.org, panicker@chromium.org

[commit-bot: I haz the power, 2016-11-02 20:15:06]

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

[panickercorp, 2016-11-02 20:27:01]

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

[panickercorp, 2016-11-02 20:27:01]

lgtm

[krasin1, 2016-11-02 20:30:48]

On 2016/11/02 20:27:01, panicker wrote:
> lgtm

Thank you!
I guess, I also need an approval from Dmitry or Andrey.

[dgozman, 2016-11-02 20:50:58]

lgtm

[krasin1, 2016-11-02 20:51:23]

The CQ bit was unchecked by krasin@chromium.org

[krasin1, 2016-11-02 20:51:27]

The CQ bit was checked by krasin@chromium.org

[krasin1, 2016-11-02 20:51:43]

On 2016/11/02 20:50:58, dgozman wrote:
> lgtm

Thank you, Dmitry!

[commit-bot: I haz the power, 2016-11-02 20:52:04]

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, 2016-11-02 21:45:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-02 21:47:23]

Description was changed from

==========
Fix vcall on nullptr in ~Performance.

This is a follow up to https://codereview.chromium.org/2449673002/

BUG=607996
==========

to

==========
Fix vcall on nullptr in ~Performance.

This is a follow up to https://codereview.chromium.org/2449673002/

BUG=607996

Committed: https://crrev.com/ebf0e626c43b986e5dfed5e961575bf31760a11c
Cr-Commit-Position: refs/heads/master@{#429409}
==========

[commit-bot: I haz the power, 2016-11-02 21:47:24]

Patchset 1 (id:??) landed as
https://crrev.com/ebf0e626c43b986e5dfed5e961575bf31760a11c
Cr-Commit-Position: refs/heads/master@{#429409}