- Renamed variables and some function to comply with style guide. - Removed default argument values. - Removed some dead code. - Cleaned up comments formatting in rtp_rtcp.h R=danilchap@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/2067673004 . Cr-Commit-Position: refs/heads/master@{#13565}