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More work remains, but is less urgent. webrtc/media/base/mediacommon.h could not be deleted since the constants are used in multiple places. BUG=webrtc:5420 TBR=pthatcher@webrtc.org Review URL: https://codereview.webrtc.org/1688753002 . Cr-Commit-Position: refs/heads/master@{#11551}