Add UnsizeMedia to struct traits

Bug: 623682
Change-Id: If6c55c0c3639d01ef6bb5be5f59410591ace44cc
Reviewed-on: https://chromium-review.googlesource.com/902194
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Luna Lu <loonybear@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534468}
1 file changed