diff --git a/api/ortc/packet_transport_interface.h b/api/ortc/packet_transport_interface.h
index 8fef2701c2..78e280a8ab 100644
--- a/api/ortc/packet_transport_interface.h
+++ b/api/ortc/packet_transport_interface.h
@@ -31,7 +31,6 @@ class PacketTransportInterface {
 
   // Classes that can use this internal interface.
   friend class RtpTransportControllerAdapter;
-  friend class RtpTransportAdapter;
 };
 
 }  // namespace webrtc
diff --git a/api/ortc/rtp_transport_interface.h b/api/ortc/rtp_transport_interface.h
index ac43831d2d..2e168858dc 100644
--- a/api/ortc/rtp_transport_interface.h
+++ b/api/ortc/rtp_transport_interface.h
@@ -21,8 +21,6 @@
 
 namespace webrtc {
 
-class RtpTransportAdapter;
-
 struct RtpTransportParameters final {
   RtcpParameters rtcp;
 
@@ -73,16 +71,11 @@ class RtpTransportInterface {
   virtual RtpTransportParameters GetParameters() const = 0;
 
  protected:
-  // Only for internal use. Returns a pointer to an internal interface, for use
-  // by the implementation.
-  virtual RtpTransportAdapter* GetInternal() = 0;
-
   // Classes that can use this internal interface.
   friend class OrtcFactory;
   friend class OrtcRtpSenderAdapter;
   friend class OrtcRtpReceiverAdapter;
   friend class RtpTransportControllerAdapter;
-  friend class RtpTransportAdapter;
 };
 
 }  // namespace webrtc
diff --git a/pc/rtp_transport.cc b/pc/rtp_transport.cc
index bd11e57cbf..f7a27be332 100644
--- a/pc/rtp_transport.cc
+++ b/pc/rtp_transport.cc
@@ -199,10 +199,6 @@ void RtpTransport::DemuxPacket(rtc::CopyOnWriteBuffer packet,
   rtp_demuxer_.OnRtpPacket(parsed_packet);
 }
 
-RtpTransportAdapter* RtpTransport::GetInternal() {
-  return nullptr;
-}
-
 bool RtpTransport::IsTransportWritable() {
   auto rtcp_packet_transport =
       rtcp_mux_enabled_ ? nullptr : rtcp_packet_transport_;
diff --git a/pc/rtp_transport.h b/pc/rtp_transport.h
index dfdabbc7fe..4573d3cce2 100644
--- a/pc/rtp_transport.h
+++ b/pc/rtp_transport.h
@@ -83,9 +83,6 @@ class RtpTransport : public RtpTransportInternal {
   bool UnregisterRtpDemuxerSink(RtpPacketSinkInterface* sink) override;
 
  protected:
-  // TODO(zstein): Remove this when we remove RtpTransportAdapter.
-  RtpTransportAdapter* GetInternal() override;
-
   // These methods will be used in the subclasses.
   void DemuxPacket(rtc::CopyOnWriteBuffer packet, int64_t packet_time_us);