Fix non-null warning in SPDYOriginEndpointManager.
Fix non-null warning in SPDYOriginEndpointManager.

The dummy call to init CFNetwork seems to be unnecessary. I can't find
any information or examples to support keeping it for iOS.

johnkdoe/CocoaSPDY,kgoodier/CocoaSPDY,kgoodier/CocoaSPDY,johnkdoe/CocoaSPDY