Replace old SkRecords RefBox with sk_sp.

The main differences are that RefBox's constructor reffed and sk_sp's doesn't,
and that RefBox auto-casts to the underlying pointer while sk_sp doesn't.

I've added a bunch of sk_ref_sp() and .get() to compensate.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2197243003

Review-Url: https://codereview.chromium.org/2197243003
4 files changed