am 7bc600cb: am f98197a7: Make sure the message dispatcher stays around until after OMX_FreeHandle is finished in case it posts some more messages during shutdown. Clear the source as soon as possible in OMXCodec\'s destructor.

Merge commit '7bc600cb08394e60eef984843976d4f79e5d94e8'

* commit '7bc600cb08394e60eef984843976d4f79e5d94e8':
  Make sure the message dispatcher stays around until after OMX_FreeHandle is finished in case it posts some more messages during shutdown. Clear the source as soon as possible in OMXCodec's destructor.