Replace calls to "Don't Save" button to "Delete" as Mountain Lion uses the latter

Specs fail in Mountain Lion as the "Don't Save" button is now "Delete".  I would think this was caused by deeper iCloud integration in apps such as TextEdit.  Specs in question should now pass in Mountain Lion.

I would think that this fix is not complete, as this should break things in Lion and earlier.  Unfortunately I do not have an environment to confirm.  May need to add a more intelligent check to call the correct button based on the OS.