The codecs expected by HasCorrectCodecs now depends which codecs were
enabled by build flags.
SendSideBweWithOverheadTest.MinAndMaxBitrate now expects different
values for min bitrate depending on if we support 120 ms frames for
Opus.
BUG=b/35415435
Review-Url: https://codereview.webrtc.org/2691343008
Cr-Commit-Position: refs/heads/master@{#16643}