Removed unused SkInterpolator

Bug: skia:11852
Change-Id: I7a9eb2e0594bc1bdf6e7ba5355b6f00cc177253f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/395476
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
10 files changed