remove fun operator overloads

Change-Id: I6ae2d5d1cbe2fc5d9d782aa96900acd5703080e9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265757
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed