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

device/serial/serial_io_handler_posix.cc

Index: device/serial/serial_io_handler_posix.cc
diff --git a/device/serial/serial_io_handler_posix.cc b/device/serial/serial_io_handler_posix.cc
index b56017488103eb95c3b9c4a442b26db12c5c5c12..45385e9ef039414a4897e7fe388fa8ab1046438e 100644
--- a/device/serial/serial_io_handler_posix.cc
+++ b/device/serial/serial_io_handler_posix.cc
@@ -398,7 +398,7 @@ serial::DeviceControlSignalsPtr SerialIoHandlerPosix::GetControlSignals()
   signals->cts = (status & TIOCM_CTS) != 0;
   signals->dsr = (status & TIOCM_DSR) != 0;
   signals->ri = (status & TIOCM_RI) != 0;
-  return signals.Pass();
+  return signals;
 }
 
 bool SerialIoHandlerPosix::SetControlSignals(
@@ -478,7 +478,7 @@ serial::ConnectionInfoPtr SerialIoHandlerPosix::GetPortInfo() const {
   info->stop_bits =
       (config.c_cflag & CSTOPB) ? serial::STOP_BITS_TWO : serial::STOP_BITS_ONE;
   info->cts_flow_control = (config.c_cflag & CRTSCTS) != 0;
-  return info.Pass();
+  return info;
 }
 
 bool SerialIoHandlerPosix::SetBreak() {