Remove interface directories kept to avoid breaking downstream.

webrtc/modules/rtp_rtcp/interface/fec_receiver.h

-/*
- *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_MODULES_RTP_RTCP_INCLUDE_FEC_RECEIVER_H_
-#define WEBRTC_MODULES_RTP_RTCP_INCLUDE_FEC_RECEIVER_H_
-
-#pragma message("WARNING: rtp_rtcp/interface is DEPRECATED; use include")
-
-#include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h"
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-struct FecPacketCounter {
-  FecPacketCounter()
-      : num_packets(0),
-        num_fec_packets(0),
-        num_recovered_packets(0) {}
-
-  size_t num_packets;            // Number of received packets.
-  size_t num_fec_packets;        // Number of received FEC packets.
-  size_t num_recovered_packets;  // Number of recovered media packets using FEC.
-};
-
-class FecReceiver {
- public:
-  static FecReceiver* Create(RtpData* callback);
-
-  virtual ~FecReceiver() {}
-
-  virtual int32_t AddReceivedRedPacket(const RTPHeader& rtp_header,
-                                       const uint8_t* incoming_rtp_packet,
-                                       size_t packet_length,
-                                       uint8_t ulpfec_payload_type) = 0;
-
-  virtual int32_t ProcessReceivedFec() = 0;
-
-  virtual FecPacketCounter GetPacketCounter() const = 0;
-};
-}  // namespace webrtc
-#endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_FEC_RECEIVER_H_