URLSessionConfiguration default initializer returns a broken object

Number:rdar://30517777 Date Originated:
Status: Resolved:
Product:iOS + SDK Product Version:Xcode 8.2.1 [8C1002]
Classification: Reproducible:Yes

URLSessionConfiguration() returns an object that is broken and crashes unrecognized selector if `protocolClasses` is accessed. It also crashes when used in a URL Session with: -[NSURLSessionConfiguration disposition]: unrecognized selector sent to instance 0x7fccf5508700

The constructor should work as the default constructor or not be available.

Steps to Reproduce:
Try to use a URLSessionConfiguration returned from `URLSessionConfiguration()`

Expected Results:
It should A) Not be available and not compile, or B) work the same as `URLSessionConfiguration.default`.

Actual Results:
The crash above.


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