Added unit test for situation where there is a requestId provided, but there's no matching callback registered.
Added unit test for situation where there is a requestId provided, but there's no matching callback registered.

Safari-FIDO-U2F/Safari-FIDO-U2F,Safari-FIDO-U2F/Safari-FIDO-U2F,Safari-FIDO-U2F/Safari-FIDO-U2F,Safari-FIDO-U2F/Safari-FIDO-U2F