Changes

readonly attribute boolean [https://wiki.mozilla.org/B2G/Bluetooth/WebBluetooth-v2/BluetoothAdapterEvent#isDefaultisDefault]; readonly attribute BluetoothAdapter? [https://wiki.mozilla.org/B2G/Bluetooth/WebBluetooth-v2/BluetoothAdapterEvent#adapteradapter]; readonly attribute DOMString? [https://wiki.mozilla.org/B2G/Bluetooth/WebBluetooth-v2/BluetoothAdapterEvent#address address];