am 18b1e79a: Bluetooth API: Do not allow apps to programmatically make BT discoverable.

Merge commit '18b1e79a123b979d25bfa5d0b0ee5d0382dbd64b' into eclair-plus-aosp

* commit '18b1e79a123b979d25bfa5d0b0ee5d0382dbd64b':
  Bluetooth API: Do not allow apps to programmatically make BT discoverable.