[Cast] Clean-up RtpCastHeader and RtpParser, removing the last WebRTC dependency.

media/cast/rtp_receiver/rtp_receiver_defines.h

 // Copyright 2013 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/rtcp/rtcp_defines.h"
-#include "third_party/webrtc/modules/interface/module_common_types.h"
 
 namespace media {
 namespace cast {
 
 struct RtpCastHeader {
-  RtpCastHeader() {
-    is_key_frame = false;
-    frame_id = 0;
-    packet_id = 0;
-    max_packet_id = 0;
-    is_reference = false;
-    reference_frame_id = 0;
-  }
-  webrtc::WebRtcRTPHeader webrtc;
+  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;
-  bool is_reference;  // Set to true if the previous frame is not available,

[miu, 2014/04/23 23:41:58]

I removed this because it is solely a detail of the
serialization/deserialization of packets.  I confirmed no downstream
implementation actually cares whether the reference_frame_id was explicitly
provided in the packet (as opposed to being set to a default value based on
frame_id).

-                      // and the reference frame id  is available.
   uint32 reference_frame_id;
 };
 
 class RtpPayloadFeedback {
  public:
   virtual void CastFeedback(const RtcpCastMessage& cast_feedback) = 0;
 
  protected:
-  virtual ~RtpPayloadFeedback() {}
+  virtual ~RtpPayloadFeedback();
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_RTP_RECEIVER_RTP_RECEIVER_DEFINES_H_