Add OWNERS for BluetoothOptionsHandler

Add per-file OWNERS for the BluetoothOptionsHandler code to match
device/bluetooth/ and the Bluetooth files in chromeos/dbus/.

BUG=None

Review URL: https://codereview.chromium.org/179683003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253497 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253497