net/http: update bundled http2
Updates http2 to x/net/http2 git rev
40a0a18 for:
http2: fix Server race with concurrent Read/Close
http2: make Server reuse 64k request body buffer between requests
http2: never Read from Request.Body in Transport to determine ContentLength
Fixes #17480
Updates #17071
Change-Id: If142925764a2e148f95957f559637cfc1785ad21
Reviewed-on: https://go-review.googlesource.com/31737
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>