am 38cf8867: Remove OBBs from state list when volume unmounted

Merge commit '38cf8867a8d3e8d5159abd0bd0e6a3b0b8348b94' into gingerbread-plus-aosp

* commit '38cf8867a8d3e8d5159abd0bd0e6a3b0b8348b94':
  Remove OBBs from state list when volume unmounted