bluetooth: Fix mac crash when logging is enabled

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 ef4a20dee2da1156e992a84add68576b47755754..01364221aa2b6e9f4b7e69c3bc6b046e02835f23 100644
--- a/device/bluetooth/bluetooth_adapter_mac.mm
+++ b/device/bluetooth/bluetooth_adapter_mac.mm
@@ -595,13 +595,15 @@ void BluetoothAdapterMac::DidFailToConnectPeripheral(CBPeripheral* peripheral,
     [low_energy_central_manager_ cancelPeripheralConnection:peripheral];
     return;
   }
-  VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
-          << ", error code: " << error.code;
+  VLOG(1) << "Failed to connect to peripheral";
   BluetoothDevice::ConnectErrorCode error_code =
-      BluetoothDeviceMac::GetConnectErrorCodeFromNSError(error);
-  VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
-          << ", error code: " << error.code
-          << ", converted into: " << error_code;
+      BluetoothDevice::ConnectErrorCode::ERROR_UNKNOWN;

[Jeffrey Yasskin, 2016/08/24 23:28:13]

If this happens when we explicitly disconnected while a connect was pending,
should we use something like ERROR_ABORTED?

[ortuno, 2016/08/25 16:39:56]

We should but I would like to do that in a separate CL that fixes all platforms.
If we were to only fix mac we would also have to change a bunch of tests. I
opened http://crbug.com/641010 to keep track.

+  if (error) {
+    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);
 }
 
@@ -613,11 +615,12 @@ void BluetoothAdapterMac::DidDisconnectPeripheral(CBPeripheral* peripheral,
     [low_energy_central_manager_ cancelPeripheralConnection:peripheral];
     return;
   }
-  VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
-          << ", error code: " << error.code;
-  BluetoothDevice::ConnectErrorCode error_code =
-      BluetoothDeviceMac::GetConnectErrorCodeFromNSError(error);
-  device_mac->DidDisconnectPeripheral(error_code);
+  VLOG(1) << "Disconnected from peripheral.";
+  if (error) {
+    VLOG(1) << "Bluetooth error, domain: " << error.domain.UTF8String
+            << ", error code: " << error.code;
+  }
+  device_mac->DidDisconnectPeripheral(error);
 }
 
 BluetoothLowEnergyDeviceMac*