bluetooth: Make public BluetoothDevice::GetName method.

device/bluetooth/bluetooth_low_energy_device_mac.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/bluetooth/bluetooth_low_energy_device_mac.h"
 
 #import <CoreFoundation/CoreFoundation.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 93 matching lines @@
   return 0;
 }
 
 uint16_t BluetoothLowEnergyDeviceMac::GetAppearance() const {
   // TODO(crbug.com/588083): Implementing GetAppearance()
   // on mac, win, and android platforms for chrome
   NOTIMPLEMENTED();
   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_;
 }
 
 bool BluetoothLowEnergyDeviceMac::IsPaired() const {
   return false;
 }
 
 bool BluetoothLowEnergyDeviceMac::IsConnected() const {
   return IsGattConnected();
@@ skipping 87 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void BluetoothLowEnergyDeviceMac::ConnectToServiceInsecurely(
     const device::BluetoothUUID& uuid,
     const ConnectToServiceCallback& callback,
     const ConnectToServiceErrorCallback& error_callback) {
   NOTIMPLEMENTED();
 }
 
-std::string BluetoothLowEnergyDeviceMac::GetDeviceName() const {
-  return base::SysNSStringToUTF8([peripheral_ name]);
-}
-
 void BluetoothLowEnergyDeviceMac::CreateGattConnectionImpl() {
   if (!IsGattConnected()) {
     GetMacAdapter()->CreateGattConnection(this);
   }
 }
 
 void BluetoothLowEnergyDeviceMac::DisconnectGatt() {
   GetMacAdapter()->DisconnectGatt(this);
 }
 
@@ skipping 150 matching lines @@
   GattServiceMap gatt_services_swapped;
   gatt_services_swapped.swap(gatt_services_);
   gatt_services_swapped.clear();
   if (create_gatt_connection_error_callbacks_.empty()) {
     // TODO(http://crbug.com/585897): Need to pass the error.
     DidDisconnectGatt();
   } else {
     DidFailToConnectGatt(error_code);
   }
 }