List-like arrow for MIDI import operations

The arrow pic for selectable items in MIDI import panel, this is how it looks like:

dark theme
https://docs.google.com/file/d/0B5alKuFoSol2WlRjR3ZPZFlKZGs/edit?usp=sharing

light theme
https://docs.google.com/file/d/0B5alKuFoSol2YnFiMjQwU3FuZFU/edit?usp=sharing