874ca3af5b163e1b3fd8802171e44ee252557842

Adding 'ReceiveCodecsHaveChanged' method that will determine if codecs HAVE changed, irrespective of order and preference. Review URL: https://codereview.webrtc.org/1291763003 Cr-Commit-Position: refs/heads/master@{#9748}
Revert of Fix PRESUBMIT.py after disabling CQ. (patchset #1 id:1 of https://codereview.webrtc.org/1192673003/)
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