Remove SkFloatToScalar.

Now that SkScalar is always float (it may someday be double, but
float to double is trivial), remove callers of SkFloatToScalar,
which is deprecated in Skia.

BUG:13694396

Change-Id: I524a9bb6f7702bc810bac55fb9d2cd5361a01cf7
15 files changed