Remove OBB bind mounts, now provided by FUSE.
Jeff Sharkey authored
The OBB storage area is now presented on a per-user basis by the FUSE
daemon, so we no longer need to create bind mounts.  (In fact, we
must use the FUSE daemon since it now correctly synthesizes UID
ownership on a per-user basis.)

Bug: 10506809
Change-Id: I2d6c5643d7c89d7a15ceb28af871e44618ad33ad
7c5e6a32