e352578bc8
Channel's API remains unchanged, but the creation of a BuiltinAudioDecoderFactory is now in Channel. The next step would be to amend Channel's API (through CreateChannel, I believe) to allow an AudioDecoderFactory to be sent along. BUG=webrtc:5805 Review-Url: https://codereview.webrtc.org/1992763002 Cr-Commit-Position: refs/heads/master@{#12893}