cast: cleanup rtp header and parsing

media/cast/net/rtp/rtp_receiver_defines.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MEDIA_CAST_RTP_RECEIVER_RTP_RECEIVER_DEFINES_H_
-#define MEDIA_CAST_RTP_RECEIVER_RTP_RECEIVER_DEFINES_H_
-
-#include "base/basictypes.h"
-#include "media/cast/cast_config.h"
-#include "media/cast/net/rtcp/rtcp_defines.h"
-
-namespace media {
-namespace cast {
-
-struct RtpCastHeader {
-  RtpCastHeader();
-
-  // Elements from RTP packet header.
-  bool marker;
-  uint8 payload_type;
-  uint16 sequence_number;
-  uint32 rtp_timestamp;
-  uint32 sender_ssrc;
-
-  // Elements from Cast header (at beginning of RTP payload).
-  bool is_key_frame;
-  uint32 frame_id;
-  uint16 packet_id;
-  uint16 max_packet_id;
-  uint32 reference_frame_id;
-
-  uint16 new_playout_delay_ms;
-};
-
-class RtpPayloadFeedback {
- public:
-  virtual void CastFeedback(const RtcpCastMessage& cast_feedback) = 0;
-
- protected:
-  virtual ~RtpPayloadFeedback();
-};
-
-}  // namespace cast
-}  // namespace media
-
-#endif  // MEDIA_CAST_RTP_RECEIVER_RTP_RECEIVER_DEFINES_H_