kwiberg d1d79f6866 Remove dead code
This code became dead when the builtin audio codec factories were
rewritten in https://codereview.webrtc.org/2997713002/.

BUG=webrtc:7821, webrtc:7822

Review-Url: https://codereview.webrtc.org/3003603002
Cr-Commit-Position: refs/heads/master@{#19535}
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