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
Review-Url: https://codereview.chromium.org/2413743002
Cr-Commit-Position: refs/heads/master@{#424767}
(cherry picked from commit 4bc70d726ec085234f888dd1342dad0108025472)

Committed: https://chromium.googlesource.com/chromium/src/+/37de6df964e163323f8461ee3fd3e9209c461038

[hush (inactive), 2016-10-12 21:27:15]

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

Review-Url: https://codereview.chromium.org/2413743002
Cr-Commit-Position: refs/heads/master@{#424767}
(cherry picked from commit 4bc70d726ec085234f888dd1342dad0108025472)
==========

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

Review-Url: https://codereview.chromium.org/2413743002
Cr-Commit-Position: refs/heads/master@{#424767}
(cherry picked from commit 4bc70d726ec085234f888dd1342dad0108025472)

Committed:
https://chromium.googlesource.com/chromium/src/+/37de6df964e163323f8461ee3fd3...
==========

[hush (inactive), 2016-10-12 21:27:17]

Committed patchset #1 (id:1) manually as
37de6df964e163323f8461ee3fd3e9209c461038.