Instead relies on SetSendingMediaStatus() to filter out receiving RTP modules. This status is now set in VoiceEngine's SetSend() for senders along with SetSendingStatus(). BUG= R=solenberg@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/1705763002 . Cr-Commit-Position: refs/heads/master@{#11768}