Metal: Remove the UNIMPLEMENTED from setBinaryRetrievableHint It spams Chrome's output. It's valid to no-op this function. Bug: chromium:1385510 Change-Id: I63476d94bbd4c075444fa260f5eed9b70b807703 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4195176 Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Geoff Lang <geofflang@chromium.org>