[EasyUnlock] Add a private API for establishing an insecure Bluetooth connection.

device/bluetooth/bluetooth_socket_chromeos.cc

Index: device/bluetooth/bluetooth_socket_chromeos.cc
diff --git a/device/bluetooth/bluetooth_socket_chromeos.cc b/device/bluetooth/bluetooth_socket_chromeos.cc
index eb53bd2e6270cfb7c093e16e868f7077aa3f8193..5eedf5b1c5a27b0028f0502067888ebb9f8a36da 100644
--- a/device/bluetooth/bluetooth_socket_chromeos.cc
+++ b/device/bluetooth/bluetooth_socket_chromeos.cc
@@ -92,6 +92,7 @@ BluetoothSocketChromeOS::~BluetoothSocketChromeOS() {
 void BluetoothSocketChromeOS::Connect(
     const BluetoothDeviceChromeOS* device,
     const BluetoothUUID& uuid,
+    SecurityLevel security_level,
     const base::Closure& success_callback,
     const ErrorCompletionCallback& error_callback) {
   DCHECK(ui_task_runner()->RunsTasksOnCurrentThread());
@@ -107,6 +108,8 @@ void BluetoothSocketChromeOS::Connect(
   device_path_ = device->object_path();
   uuid_ = uuid;
   options_.reset(new BluetoothProfileManagerClient::Options());
+  if (security_level == SECURITY_LEVEL_LOW)
+    options_->require_authentication.reset(new bool(false));
 
   RegisterProfile(success_callback, error_callback);
 }