Reject requests to SharedWorker resources when shared workers are not
supported. The caller is required to handle the rejection in whatever
way makes sense for the calling code.
Signed-off-by: Bill Erickson <berickxx@gmail.com> Signed-off-by: Terran McCanna <tmccanna@georgialibraries.org> Signed-off-by: Jason Boyer <JBoyer@equinoxinitiative.org> Signed-off-by: Jason Stephenson <jason@sigio.com> Signed-off-by: John Amundson <jamundson@cwmars.org>