[release-branch.go1.15] net/http: update bundled x/net/http2

Bring in the change in CL 304309 with:

	go mod edit -replace=golang.org/x/net=golang.org/x/net@release-branch.go1.15-bundle
	GOFLAGS='-mod=mod' go generate -run=bundle std
	go mod edit -dropreplace=golang.org/x/net
	go get -d golang.org/x/net@release-branch.go1.15
	go mod tidy
	go mod vendor

For #45076.
Updates #40213.

Change-Id: I68d5e1f2394508c9cf8627fb852dd9e906d45016
Reviewed-on: https://go-review.googlesource.com/c/go/+/305489
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>

diff --git a/src/net/http/h2_bundle.go b/src/net/http/h2_bundle.go
index 678c6eb9d4a376e7d7cdea219347765f77fe2868..3d830847022c2bb75f4db9ad348a5b0571d4dc1d 100644 (file)
--- a/src/net/http/h2_bundle.go
+++ b/src/net/http/h2_bundle.go
@@ -8985,6 +8985,8 @@ func http2strSliceContains(ss []string, s string) bool {
 
 type http2erringRoundTripper struct{ err error }
 
+func (rt http2erringRoundTripper) RoundTripErr() error { return rt.err }
+
 func (rt http2erringRoundTripper) RoundTrip(*Request) (*Response, error) { return nil, rt.err }
 
 // gzipReader wraps a response body so it can lazily