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

device/bluetooth/bluetooth_adapter_mac.mm

Index: device/bluetooth/bluetooth_adapter_mac.mm
diff --git a/device/bluetooth/bluetooth_adapter_mac.mm b/device/bluetooth/bluetooth_adapter_mac.mm
index d0f98c4478a38e00d131d24c68594e3934dcf4bf..dca907ffdeac4f616fb7be80f9b5869985590224 100644
--- a/device/bluetooth/bluetooth_adapter_mac.mm
+++ b/device/bluetooth/bluetooth_adapter_mac.mm
@@ -561,15 +561,13 @@
     [low_energy_central_manager_ cancelPeripheralConnection:peripheral];
     return;
   }
+  VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
+          << ", error code: " << error.code;
   BluetoothDevice::ConnectErrorCode error_code =
-      BluetoothDevice::ConnectErrorCode::ERROR_FAILED;
-  VLOG(1) << "Fail to connect to peripheral";
-  if (error) {
-    error_code = BluetoothDeviceMac::GetConnectErrorCodeFromNSError(error);
-    VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
-            << ", error code: " << error.code
-            << ", converted into: " << error_code;
-  }
+      BluetoothDeviceMac::GetConnectErrorCodeFromNSError(error);
+  VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
+          << ", error code: " << error.code
+          << ", converted into: " << error_code;
   device_mac->DidFailToConnectGatt(error_code);
 }
 
@@ -581,14 +579,11 @@
     [low_energy_central_manager_ cancelPeripheralConnection:peripheral];
     return;
   }
-  VLOG(1) << "Peripheral disconnected";
-  if (error) {
-    VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
-            << ", error code: " << error.code;
-    // TODO(http://crbug.com/585897): Need to pass the error to
-    // DidDisconnectPeripheral().
-  }
-  device_mac->DidDisconnectPeripheral();
+  VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
+          << ", error code: " << error.code;
+  BluetoothDevice::ConnectErrorCode error_code =
+      BluetoothDeviceMac::GetConnectErrorCodeFromNSError(error);
+  device_mac->DidDisconnectPeripheral(error_code);
 }
 
 BluetoothLowEnergyDeviceMac*