tree 012f9fcc7c05aa5f0b5b990050cf3a1005befa8a
parent a980ce57f3a7dd6dcba5164da94e8a8563d844eb
author bnc <bnc@google.com> 1560539804 -0700
committer Copybara-Service <copybara-worker@google.com> 1560541863 -0700

Add DCHECK to VersionUsesQpack().

QPACK streams can only be instantiated if the transport version supports
unidirectional stream types.  Document this using a DCHECK.

gfe-relnote: Add DCHECK that obviously will never fail.
PiperOrigin-RevId: 253273733
Change-Id: Iefb3f56f97ef54322f850ad58ecbfe1ec9c522a1