mono/mono — pull request #1371 by martinjt (2014-10-26 23:47:44+00:00)
Title: Add ClientDisconnectedToken property to HttpResponseBase and Wrapper as ...

...default None.

I don't profess to know what it does, however, I've looked at the usage of this in the aspnetwebstack, and under a few scenarios, it defaults it's own helper method to CancellationToken.None. Therefore I'm assuming this is ok as a default in the code.