nisse 40ba3addc7 Delete unused member RTCPSender::FeedbackState::send_payload_type.
It became unused with cl https://codereview.webrtc.org/2746413003/

BUG=webrtc:7338

Review-Url: https://codereview.webrtc.org/2759433005
Cr-Commit-Position: refs/heads/master@{#17293}
2017-03-17 14:04:00 +00:00
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