x->getSomething(x->getImplementationId()) doesn't make any sense

...the point of the aIdentifier parameter to css.lang.XUnoTunnel.getSomething is
so that caller and callee can verify they know each other and the value passed
back (pointer in local address space, in this case) will actually make sense for
the caller.

Change-Id: Id79c419307992b30ea6ef7997b74a015631ad21c