[canvaskit] Clean up embedded fonts

See https://groups.google.com/forum/#!topic/skia-discuss/J2XT7XjmFtI

Change-Id: I73614208d26536924bc3ed3385c1cd3c490ef8a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/247098
Reviewed-by: Ben Wagner <bungeman@google.com>
3 files changed