don't test index8 -- no longer supported

Bug: skia:6828
Change-Id: I7ce4d91c2fa66b3a81e5143819dd9d774fa1c116
Reviewed-on: https://skia-review.googlesource.com/23140
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
1 file changed