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i.e. when chain are used, require each decode target to be protected by some chain. where previously it was allowed to mark decode target as unprotected. See https://github.com/AOMediaCodec/av1-rtp-spec/pull/125 Bug: webrtc:10342 Change-Id: Ia2800036e890db44bb1162abfa1a497ff68f3b24 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178807 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31772}