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https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#sourcebuffer-stream-append-loop Step 3 of the algorithm says "If stream has been aborted, then run the append error algorithm and abort this algorithm." There is no "aborted" status of a stream. If the source of the stream is aborted (e.g. XHR abort()) then a read error will occur in step 7.
Changes committed. https://dvcs.w3.org/hg/html-media/rev/dcd406812201