Remove some unneeded SkSpan calls

Change-Id: Ic2052c326581f67bd9b9480ed1912997272471f6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/550219
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed