http2: skip creating native ShutdownWrap
ShutdownWrap
instances are being used to carry context between the
start and the asynchronous end of shutting down the writable side of
a StreamBase
. HTTP/2 streams always perform this action
synchronously, so no such object is necessary.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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