It used to take a WebRtcRTPHeader as input, which has an RTPHeader as a member. None of the other member in WebRtcRTPHeader where used in NetEq. This CL adapts the production code; tests and tools will be converted in a follow-up CL. BUG=webrtc:7467 Review-Url: https://codereview.webrtc.org/2807273004 Cr-Commit-Position: refs/heads/master@{#17652}