Remove unreferenced function in SkFloatingPoint.

`sk_floats_are_unit` was not used anywhere in Skia.

Change-Id: I20b8a55e2511fb0c398ddded03975a44347438ea
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/842496
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
4 files changed