net/http: avoid redundant installation of HTTP/2 support in transport
Previously, we'd skip installing the bundled HTTP/2 support
if Transport.TLSNextProto is non-nil.
With the addition of the Transport.Protocols field, we'll
install HTTP/2 if Protocols contains HTTP2, even if TLSNextProto
is non-nil. However, we shouldn't do so if it already contains an
"h2" entry.
Change-Id: Ib086473bb52f1b76d83b1df961d41360c605832c
Reviewed-on: https://go-review.googlesource.com/c/go/+/631395
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Jonathan Amsterdam <jba@google.com>
Auto-Submit: Damien Neil <dneil@google.com>