mobile/bind: fix tests
mobile/bind: fix tests

Fix the tests that CL 20575 broke.

Change-Id: Id4059547c289c693ed4cfda6f748209d3e7f8658
Reviewed-on: https://go-review.googlesource.com/20620
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

golang/mobile,golang/mobile,golang/mobile,golang/mobile