Since it no longer holds a reference count, just use values.
For #70907
Change-Id: I19a42583988d4f8a9133b1c837356ca0179d688c
Reviewed-on: https://go-review.googlesource.com/c/go/+/638578
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Robert Griesemer <gri@google.com>