Reimplement the builtin audio codec factories using the new stuff in api/
The whole point of all the audio codec stuff we've recently published
in api/ is to function as lego bricks so that building stuff like our
builtin audio codec factories will be easy.
BUG=webrtc:7821, webrtc:7822
Review-Url: https://codereview.webrtc.org/2997713002
Cr-Original-Commit-Position: refs/heads/master@{#19446}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 417989a8643d0d19052a87e95905b469d5ede173
10 files changed
