cros: Clean up TrayBluetoothHelper todos

ash/common/system/chromeos/bluetooth/tray_bluetooth_helper_unittest.cc

Index: ash/common/system/chromeos/bluetooth/tray_bluetooth_helper_unittest.cc
diff --git a/ash/common/system/chromeos/bluetooth/tray_bluetooth_helper_unittest.cc b/ash/common/system/chromeos/bluetooth/tray_bluetooth_helper_unittest.cc
index 01da12cd4285926a8450b2fb1255ec7a6863e428..68bf1c2107121e73930aaaece5e9ffd0b8c8bf95 100644
--- a/ash/common/system/chromeos/bluetooth/tray_bluetooth_helper_unittest.cc
+++ b/ash/common/system/chromeos/bluetooth/tray_bluetooth_helper_unittest.cc
@@ -35,8 +35,7 @@ TEST_F(TrayBluetoothHelperTest, Basics) {
   EXPECT_FALSE(helper.GetBluetoothEnabled());
   EXPECT_FALSE(helper.HasBluetoothDiscoverySession());
 
-  std::vector<ash::BluetoothDeviceInfo> devices;
-  helper.GetAvailableBluetoothDevices(&devices);
+  BluetoothDeviceList devices = helper.GetAvailableBluetoothDevices();
   // The devices are fake in tests, so don't assume any particular number.
   EXPECT_FALSE(devices.empty());