Fix up fuzzers implicit dependency on default SkFontMgr

Requires https://crrev.com/c/5028038 to land

Bug: b/305780908
Change-Id: Ib3452ebf6066d8f7ea0194f66e2e726ca91ded0a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/779376
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
8 files changed