bluetooth: macOS: Remove c-style casting

device/bluetooth/bluetooth_remote_gatt_service_mac.mm

Index: device/bluetooth/bluetooth_remote_gatt_service_mac.mm
diff --git a/device/bluetooth/bluetooth_remote_gatt_service_mac.mm b/device/bluetooth/bluetooth_remote_gatt_service_mac.mm
index 15ec871c4d9a4445f17a20fcef5bfac13ff65f5b..978310610abc8ee5ee54bdf9e53b3a7a6b9ff598 100644
--- a/device/bluetooth/bluetooth_remote_gatt_service_mac.mm
+++ b/device/bluetooth/bluetooth_remote_gatt_service_mac.mm
@@ -29,7 +29,7 @@ BluetoothRemoteGattServiceMac::BluetoothRemoteGattServiceMac(
   uuid_ = BluetoothAdapterMac::BluetoothUUIDWithCBUUID([service_.get() UUID]);
   identifier_ = base::SysNSStringToUTF8(
       [NSString stringWithFormat:@"%s-%p", uuid_.canonical_value().c_str(),
-                                 (void*)service_]);
+                                 service_.get()]);
 }
 
 BluetoothRemoteGattServiceMac::~BluetoothRemoteGattServiceMac() {}