net/http: regenerate h2_bundle.go

net/http: regenerate h2_bundle.go

Done with:

	go generate -run=bundle std

After CL 452096 updated the x/net version.

Change-Id: I1c1cd76d4ec9e14f45dc66c945c74e41ff689a30
Reviewed-on: https://go-review.googlesource.com/c/go/+/452195
Reviewed-by: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>