remove unimplemented sk_data_new_empty()

Bug: skia:9585
Change-Id: I1fefd3598478d2f2c157d3a91750b5b92479b1b2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330278
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed