Convert Pass()→std::move() in //device

device/serial/test_serial_io_handler.cc

Index: device/serial/test_serial_io_handler.cc
diff --git a/device/serial/test_serial_io_handler.cc b/device/serial/test_serial_io_handler.cc
index dec818486862a0a59db4ac0292ddb8158a3306a8..b112462b49c5c73174981266dd6b4ebc882d849f 100644
--- a/device/serial/test_serial_io_handler.cc
+++ b/device/serial/test_serial_io_handler.cc
@@ -81,13 +81,13 @@ bool TestSerialIoHandler::ConfigurePortImpl() {
 serial::DeviceControlSignalsPtr TestSerialIoHandler::GetControlSignals() const {
   serial::DeviceControlSignalsPtr signals(serial::DeviceControlSignals::New());
   *signals = device_control_signals_;
-  return signals.Pass();
+  return signals;
 }
 
 serial::ConnectionInfoPtr TestSerialIoHandler::GetPortInfo() const {
   serial::ConnectionInfoPtr info(serial::ConnectionInfo::New());
   *info = info_;
-  return info.Pass();
+  return info;
 }
 
 bool TestSerialIoHandler::Flush() const {