fix typo from prev refactor -- hinting is on font

... and IWYU
Preparation for https://skia-review.googlesource.com/c/skia/+/185460

TBR=

Bug: skia:2664
Change-Id: I9379ad69c3e7baabf736dd2e7d2c285eb81d43b4
Reviewed-on: https://chromium-review.googlesource.com/c/1423627
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
Cr-Commit-Position: refs/heads/master@{#624483}
5 files changed