Remove REMB accessor as used for debug checks only. Merge SetRembData and SetRembStatus(true) eliminating state 'remb can be send, but no data available yet' Bug: None Change-Id: I4c1c19435657e5cde02a17de90ec6de9f00b7daf Reviewed-on: https://webrtc-review.googlesource.com/7983 Reviewed-by: Elad Alon <eladalon@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20240}