Fix nullptr crash inXFA_FFBarcode::UpdateWidgetProperty().

Fix nullptr crash inXFA_FFBarcode::UpdateWidgetProperty().

BUG=chromium:655455
Committed: https://pdfium.googlesource.com/pdfium/+/36bad2b022014ea7161fe888fec1191d2ba6b894

[Lei Zhang, 2016-10-13 20:17:35]

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

[commit-bot: I haz the power, 2016-10-13 20:17:46]

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, 2016-10-13 20:25:36]

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

[commit-bot: I haz the power, 2016-10-13 20:25:37]

Dry run: This issue passed the CQ dry run.

[Lei Zhang, 2016-10-13 20:28:18]

thestig@chromium.org changed reviewers:
+ dsinclair@chromium.org

[dsinclair, 2016-10-13 20:32:46]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2016-10-13 20:32:47]

lgtm

[commit-bot: I haz the power, 2016-10-13 20:32:49]

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 20:33:07]

Description was changed from

==========
Fix nullptr crash inXFA_FFBarcode::UpdateWidgetProperty().

BUG=chromium:655455
==========

to

==========
Fix nullptr crash inXFA_FFBarcode::UpdateWidgetProperty().

BUG=chromium:655455

Committed:
https://pdfium.googlesource.com/pdfium/+/36bad2b022014ea7161fe888fec1191d2ba6...
==========

[commit-bot: I haz the power, 2016-10-13 20:33:09]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/36bad2b022014ea7161fe888fec1191d2ba6...