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Step 10 of EME's "Get Supported Capabilities for Audio/Video Type" algorithm says we can assume default codecs only if a container normatively implies a specific set of codec and codec constraints. Our code assumes that WebM implies Vorbis/VP8 and MP4 implies AAC/H.264, but those aren't actually normatively required by either of these containers' specifications. So we shouldn't assume these containers imply those codecs. MozReview-Commit-ID: G9TDOmrjhpp --HG-- extra : rebase_source : 2f040d76c8cb240359401fe1dc1e3eefa029d77b