Delete unused makeIndexWriter functions

Change-Id: I85948e54f642a31af01c9c3ac5a2fc1772d70746
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1123316
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Kaylee Lubick <kjlubick@google.com>
2 files changed