Remove SkColorLookUpTable::interp3D().

It looks like our recursive approach is faster than interp3D(),
and we'd prefer trilinear interpolation over tetrahedral for quality.

Change-Id: I1019254b9ecf24b2f4feff17ed8ae1b48fcc281e
Reviewed-on: https://skia-review.googlesource.com/32800
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed