Remove Sk(Float|Double)PinToFixed functions, only used in tests.

These were triggering compile-time floating point overflow for one user,
and we don't use them.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1952303005

Review-Url: https://codereview.chromium.org/1952303005
2 files changed