net/http: use sync.OnceFunc, sync.OnceValue
Use sync.OnceFunc and sync.OnceValue to simplify the code.
Change-Id: Ie47e0444c2b9d3260f6ef94cdc6ee8ee5bcf9f71
GitHub-Last-Rev:
520afbec2a392d73dfd9697035804be7c7cc8b77
GitHub-Pull-Request: golang/go#69634
Reviewed-on: https://go-review.googlesource.com/c/go/+/616037
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>