So we won't pass an unused |nsIStreamListener**| to MediaSourceDecoder::Load().
MozReview-Commit-ID: 2TCby8m8K5H
--HG--
extra : rebase_source : 349179aa4303c0abd8b86a695789770e158e5c28
extra : intermediate-source : d6f550bd6709a0ee7db6033286af42565a20cdb1
extra : source : ed524d855a1a78665c499152a9360ba961655641
We also move some methods to protected so they are callable from ChannelMediaDecoder.
MozReview-Commit-ID: 6s9LKNkbJhX
--HG--
extra : rebase_source : 172ea88bc01552a90f5ef51db2b5af0ac5551c3b
extra : intermediate-source : a724333159c6b408e2fa68dba2d0a467f3c55940
extra : source : 03760e05ea8044b3404d29bb62205a2f62892d4b