Cleanup code gated by SK_DISABLE_SKFONTARGS_CHANGED_TYPE

Land after [1].

[1] https://chromium-review.googlesource.com/c/chromium/src/+/5165370

Bug: b/317330945
Change-Id: I7089f8abe6c46aaf20765559ca9007e45cbae008
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/796196
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
4 files changed