Removes parsing code in ParseRtpPacket. Bug: none Change-Id: I190b3f8abd5f1881cf19e14b7f31cc8f85b5f156 Reviewed-on: https://webrtc-review.googlesource.com/86823 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Commit-Queue: Åsa Persson <asapersson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23829}