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Since the number of streams is now known on construction we can initialize all RTP modules on construction. They are internally locked so we don't nede a simulcast lock anymore. BUG=1695 R=mflodman@webrtc.org, stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/52639004 . Cr-Commit-Position: refs/heads/master@{#9577}