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Since the RtpStreamId and RepairedRtpStreamId extensions can have variable length, it makes no sense for them to have a constant valueSize field. The header length calculation in RtpHeaderExtensionMap needed to be changed for this because it previously worked with the assumption that all header types have a constant size. Now it's the caller's job to specify the length of the extensions that it might use. BUG=webrtc:7433 Review-Url: https://codereview.webrtc.org/2867713003 Cr-Commit-Position: refs/heads/master@{#18179}