Fix a crash where the dragged content does not contain any text.

Fix a crash where the dragged content does not contain any text.

The filtered mimetypes array could be null instead of an empty array. We need to
check for that.

BUG=655081
Committed: https://crrev.com/4bc70d726ec085234f888dd1342dad0108025472
Cr-Commit-Position: refs/heads/master@{#424767}

[hush (inactive), 2016-10-12 15:43:45]

hush@chromium.org changed reviewers:
+ tedchoc@chromium.org

[hush (inactive), 2016-10-12 15:43:46]

Hello Ted,
PTAL

[Ted C, 2016-10-12 15:57:11]

lgtm

[hush (inactive), 2016-10-12 16:23:19]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2016-10-12 16:23:42]

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, 2016-10-12 17:05:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-12 17:49:18]

Description was changed from

==========
Fix a crash where the dragged content does not contain any text.

The filtered mimetypes array could be null instead of an empty array. We need to
check for that.

BUG=655081
==========

to

==========
Fix a crash where the dragged content does not contain any text.

The filtered mimetypes array could be null instead of an empty array. We need to
check for that.

BUG=655081

Committed: https://crrev.com/4bc70d726ec085234f888dd1342dad0108025472
Cr-Commit-Position: refs/heads/master@{#424767}
==========

[commit-bot: I haz the power, 2016-10-12 17:49:19]

Patchset 1 (id:??) landed as
https://crrev.com/4bc70d726ec085234f888dd1342dad0108025472
Cr-Commit-Position: refs/heads/master@{#424767}