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Hide |filenameEdit_| line edit box when there is no image to be displayed.
This fixes an undesired grey line appearing as the bottom of this edit box.
Changing the "disabled" state doesn't change the style of this box,
"disabled" state is only used for read-only behaviour not style.

R=fukino@chromium.org

Bug: 796503
Change-Id: I6fc9a4eb218231781325ba7a5af992b12610b929
Reviewed-on: https://chromium-review.googlesource.com/c/1212263Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Alexander Nohe <nohe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596972}