net/http: close req.Body only when it's non-nil on js
The main change here is fixing the panic where it was called even when
req.Body was nil. It might also work better to keep the req.Body.Close
calls closer after req.Body is read, so do that too.
Calling readableStreamPull.Release on a js.Func with a zero value
is currently a no-op, but it seems better to avoid it anyway.
Also remove readableStreamStart, readableStreamCancel while here.
They were used in the initial but not final patch set of CL 458395.
Fixes #60809.
Change-Id: I6ff2e3b6ec2cd4b0c9c67939903e32908312db8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/503676 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
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