Update IWYU with remove and unique

Change-Id: If5aa5c4f68dea58b6c34f659a32d0f8a2d959b5b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/788799
Auto-Submit: Herb Derby <herb@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed