net/http: update bundled x/net/http2
This updates x/net/http2 to x/net git rev
351d144f for:
http2: revert Transport's strict interpretation of MAX_CONCURRENT_STREAMS
https://golang.org/cl/151857
http2: don't leak streams on broken body
https://golang.org/cl/132715
http2: remove support for Go 1.8 and earlier
https://golang.org/cl/145677
http2: reduce init-time work & allocations
https://golang.org/cl/127664
And some CLs fixing typos.
Fixes #27044
Fixes #27208
Change-Id: I11cc32576c690199ceb4c0bd1448d01e3cab3097
Reviewed-on: https://go-review.googlesource.com/c/152080
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>