Revert of Bluetooth: mac: Crash while loging nil error.

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 372 matching lines @@
        it != gatt_services_.end(); ++it) {
     device::BluetoothRemoteGattService* gatt_service = it->second;
     device::BluetoothRemoteGattServiceMac* gatt_service_mac =
         static_cast<BluetoothRemoteGattServiceMac*>(gatt_service);
     if (gatt_service_mac->GetService() == cb_service)
       return gatt_service_mac;
   }
   return nullptr;
 }
 
-void BluetoothLowEnergyDeviceMac::DidDisconnectPeripheral() {
+void BluetoothLowEnergyDeviceMac::DidDisconnectPeripheral(
+    BluetoothDevice::ConnectErrorCode error_code) {
   SetGattServicesDiscoveryComplete(false);
   // Removing all services at once to ensure that calling GetGattService on
   // removed service in GattServiceRemoved returns null.
   GattServiceMap gatt_services_swapped;
   gatt_services_swapped.swap(gatt_services_);
   gatt_services_swapped.clear();
-  DCHECK(create_gatt_connection_error_callbacks_.empty());
-  DidDisconnectGatt();
+  if (create_gatt_connection_error_callbacks_.empty()) {
+    // TODO(http://crbug.com/585897): Need to pass the error.
+    DidDisconnectGatt();
+  } else {
+    DidFailToConnectGatt(error_code);
+  }
 }