Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Overlooked the possibility for m_frame->settings() to be null during destruction, see crash reports in the bug below.

BUG=652089
Committed: https://crrev.com/3dbe3f2b9597110d90ed86f0c50900146f83658e
Cr-Commit-Position: refs/heads/master@{#422492}

[Eric Seckler, 2016-10-02 08:54:37]

Description was changed from

==========
Fix potential crashes in setHasHorizontal/VerticalScrollbar.

BUG=652089
==========

to

==========
Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Overlooked the possibility for m_frame->settings() to be null during
destruction, see crash reports in the bug below.

BUG=652089
==========

[Eric Seckler, 2016-10-02 08:54:37]

eseckler@chromium.org changed reviewers:
+ skobes@chromium.org

[Eric Seckler, 2016-10-02 08:56:23]

PTAL asap. Thanks (and sorry..)!

[Eric Seckler, 2016-10-02 08:57:04]

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

[commit-bot: I haz the power, 2016-10-02 08:57:11]

Dry run: 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, 2016-10-02 10:21:01]

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

[commit-bot: I haz the power, 2016-10-02 10:21:02]

Dry run: This issue passed the CQ dry run.

[skobes, 2016-10-03 18:09:07]

lgtm

[Eric Seckler, 2016-10-03 18:21:37]

The CQ bit was checked by eseckler@chromium.org

[commit-bot: I haz the power, 2016-10-03 18:22:12]

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, 2016-10-03 19:33:19]

Description was changed from

==========
Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Overlooked the possibility for m_frame->settings() to be null during
destruction, see crash reports in the bug below.

BUG=652089
==========

to

==========
Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Overlooked the possibility for m_frame->settings() to be null during
destruction, see crash reports in the bug below.

BUG=652089
==========

[commit-bot: I haz the power, 2016-10-03 19:33:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-03 19:34:39]

Description was changed from

==========
Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Overlooked the possibility for m_frame->settings() to be null during
destruction, see crash reports in the bug below.

BUG=652089
==========

to

==========
Fix potential crashes in setHasHorizontal/VerticalScrollbar.

Overlooked the possibility for m_frame->settings() to be null during
destruction, see crash reports in the bug below.

BUG=652089

Committed: https://crrev.com/3dbe3f2b9597110d90ed86f0c50900146f83658e
Cr-Commit-Position: refs/heads/master@{#422492}
==========

[commit-bot: I haz the power, 2016-10-03 19:34:40]

Patchset 1 (id:??) landed as
https://crrev.com/3dbe3f2b9597110d90ed86f0c50900146f83658e
Cr-Commit-Position: refs/heads/master@{#422492}