cleanup back links for support data

Change-Id: I454b485728a71829a0b3a92ce0c6f27002ae6649
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/472097
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed