Remove exception_wrapper::throwException
Remove exception_wrapper::throwException

Summary:
[Folly] Remove `exception_wrapper::throwException`.

It has been renamed to `throw_exception`.

Reviewed By: Orvid

Differential Revision: D5181005

fbshipit-source-id: 442b3fd9bdaa8170db504a81651cbb085ea50624

Orvid/folly,rklabs/folly,rklabs/folly,facebook/folly,Orvid/folly,facebook/folly,rklabs/folly,rklabs/folly,Orvid/folly,rklabs/folly,facebook/folly,facebook/folly,Orvid/folly,Orvid/folly,facebook/folly