change 'use' fate to 'copy' for piped data (#1955)
change 'use' fate to 'copy' for piped data (#1955)


PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs