`defaultSessionConfiguration.protocolClasses` no longer empty

In iOS 8:

```
ap  NSURLSessionConfiguration.defaultSessionConfiguration.protocolClasses
[
    [0] _NSURLHTTPProtocol < _NSCFURLProtocol,
    [1] _NSURLDataProtocol < _NSCFURLProtocol,
    [2] _NSURLFTPProtocol < _NSCFURLProtocol,
    [3] _NSURLFileProtocol < _NSCFURLProtocol,
    [4] NSAboutURLProtocol < NSURLProtocol
]
```

In iOS < 8:

```
ap  NSURLSessionConfiguration.defaultSessionConfiguration.protocolClasses
[]
```