Delete media transport integration.

MediaTransport is deprecated and the code is unused.

No-Try: True
Bug: webrtc:9719
Change-Id: I5b864c1e74bf04df16c15f51b8fac3d407331dcd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160620
Commit-Queue: Bjorn Mellem <mellem@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29923}
diff --git a/video/encoder_rtcp_feedback.h b/video/encoder_rtcp_feedback.h
index 21624db..b5dd028 100644
--- a/video/encoder_rtcp_feedback.h
+++ b/video/encoder_rtcp_feedback.h
@@ -12,7 +12,6 @@
 
 #include <vector>
 
-#include "api/transport/media/media_transport_interface.h"
 #include "api/video/video_stream_encoder_interface.h"
 #include "call/rtp_video_sender_interface.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
@@ -24,12 +23,9 @@
 class VideoStreamEncoderInterface;
 
 // This class passes feedback (such as key frame requests or loss notifications)
-// from either Mediatransport or the RtpRtcp module.
-// TODO(bugs.webrtc.org/9719): Should be eliminated when RtpMediaTransport is
-// implemented.
+// from the RtpRtcp module.
 class EncoderRtcpFeedback : public RtcpIntraFrameObserver,
-                            public RtcpLossNotificationObserver,
-                            public MediaTransportKeyFrameRequestCallback {
+                            public RtcpLossNotificationObserver {
  public:
   EncoderRtcpFeedback(Clock* clock,
                       const std::vector<uint32_t>& ssrcs,
@@ -40,9 +36,6 @@
 
   void OnReceivedIntraFrameRequest(uint32_t ssrc) override;
 
-  // Implements MediaTransportKeyFrameRequestCallback
-  void OnKeyFrameRequested(uint64_t channel_id) override;
-
   // Implements RtcpLossNotificationObserver.
   void OnReceivedLossNotification(uint32_t ssrc,
                                   uint16_t seq_num_of_last_decodable,