Removing -[NSString UTF8String] calls

device/bluetooth/bluetooth_remote_gatt_service_mac.mm

 // Copyright 2016 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_remote_gatt_service_mac.h"
 
 #import <CoreBluetooth/CoreBluetooth.h>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
+#include "base/strings/sys_string_conversions.h"
 #include "device/bluetooth/bluetooth_adapter_mac.h"
 #include "device/bluetooth/bluetooth_low_energy_device_mac.h"
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic_mac.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 
 namespace device {
 
 BluetoothRemoteGattServiceMac::BluetoothRemoteGattServiceMac(
     BluetoothLowEnergyDeviceMac* bluetooth_device_mac,
     CBService* service,
     bool is_primary)
     : bluetooth_device_mac_(bluetooth_device_mac),
       service_(service, base::scoped_policy::RETAIN),
       is_primary_(is_primary),
       is_discovery_complete_(false),
       discovery_pending_count_(0) {
   uuid_ = BluetoothAdapterMac::BluetoothUUIDWithCBUUID([service_.get() UUID]);
-  identifier_ =
+  identifier_ = base::SysNSStringToUTF8(
       [NSString stringWithFormat:@"%s-%p", uuid_.canonical_value().c_str(),
-                                 (void*)service_]
-          .UTF8String;
+                                 (void*)service_]);
 }
 
 BluetoothRemoteGattServiceMac::~BluetoothRemoteGattServiceMac() {}
 
 std::string BluetoothRemoteGattServiceMac::GetIdentifier() const {
   return identifier_;
 }
 
 BluetoothUUID BluetoothRemoteGattServiceMac::GetUUID() const {
   return uuid_;
@@ skipping 197 matching lines @@
     const BluetoothRemoteGattServiceMac& service) {
   const BluetoothLowEnergyDeviceMac* bluetooth_device_mac_ =
       static_cast<const BluetoothLowEnergyDeviceMac*>(service.GetDevice());
   return out << "<BluetoothRemoteGattServiceMac "
              << service.GetUUID().canonical_value() << "/" << &service
              << ", device: " << bluetooth_device_mac_->GetAddress() << "/"
              << bluetooth_device_mac_ << ">";
 }
 
 }  // namespace device