bluetooth: Make public BluetoothDevice::GetName method.

device/bluetooth/bluetooth_low_energy_device_mac.mm

Index: device/bluetooth/bluetooth_low_energy_device_mac.mm
diff --git a/device/bluetooth/bluetooth_low_energy_device_mac.mm b/device/bluetooth/bluetooth_low_energy_device_mac.mm
index fb7a379316516ccca0178031bc969c295d79f12d..6995dbedf4fca6c468039040ae2c2d1dba13c996 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.mm
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.mm
@@ -111,6 +111,12 @@ uint16_t BluetoothLowEnergyDeviceMac::GetAppearance() const {
   return 0;
 }
 
+base::Optional<std::string> BluetoothLowEnergyDeviceMac::GetName() const {
+  if ([peripheral_ name])
+    return base::SysNSStringToUTF8([peripheral_ name]);
+  return base::nullopt;
+}
+
 int BluetoothLowEnergyDeviceMac::GetRSSI() const {
   return rssi_;
 }
@@ -218,10 +224,6 @@ void BluetoothLowEnergyDeviceMac::ConnectToServiceInsecurely(
   NOTIMPLEMENTED();
 }
 
-std::string BluetoothLowEnergyDeviceMac::GetDeviceName() const {
-  return base::SysNSStringToUTF8([peripheral_ name]);
-}
-
 void BluetoothLowEnergyDeviceMac::CreateGattConnectionImpl() {
   if (!IsGattConnected()) {
     GetMacAdapter()->CreateGattConnection(this);