Simplify RtpRtcp interface for REMB

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}
diff --git a/video/video_send_stream_tests.cc b/video/video_send_stream_tests.cc
index faf47c7..e21bc06 100644
--- a/video/video_send_stream_tests.cc
+++ b/video/video_send_stream_tests.cc
@@ -1444,8 +1444,8 @@
                           "bps",
                           false);
         if (total_bitrate_bps > kHighBitrateBps) {
-          rtp_rtcp_->SetREMBData(kRembBitrateBps,
-                                 std::vector<uint32_t>(1, header.ssrc));
+          rtp_rtcp_->SetRemb(kRembBitrateBps,
+                             std::vector<uint32_t>(1, header.ssrc));
           rtp_rtcp_->Process();
           bitrate_capped_ = true;
         } else if (bitrate_capped_ &&
@@ -1465,7 +1465,6 @@
       config.outgoing_transport = feedback_transport_.get();
       config.retransmission_rate_limiter = &retranmission_rate_limiter_;
       rtp_rtcp_.reset(RtpRtcp::CreateRtpRtcp(config));
-      rtp_rtcp_->SetREMBStatus(true);
       rtp_rtcp_->SetRTCPStatus(RtcpMode::kReducedSize);
     }