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If an HTTP/2 WebSocket server closed a stream with no error there it
would trigger a DCHECK in WebSocketSpdyStreamAdapter::OnClose, due to an
assumption that this method would not be called with an OK status.

Accept the OK status and translate it into an ERR_CONNECTION_CLOSED.

Also add a unit test for this condition.

BUG=1139140

Change-Id: Iaa25ba45606f388d15b377154a6d2273d006fb01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489104
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819714}