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

media/cast/rtp_receiver/receiver_stats.cc

 // 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.
 
 #include "media/cast/rtp_receiver/receiver_stats.h"
 
 #include "base/logging.h"
 #include "media/cast/rtp_receiver/rtp_receiver_defines.h"
 
 namespace media {
@@ skipping 57 matching lines @@
 
   *jitter = static_cast<uint32>(std::abs(jitter_.InMillisecondsRoundedUp()));
 
   // Reset interval values.
   interval_min_sequence_number_ = 0;
   interval_number_packets_ = 0;
   interval_wrap_count_ = 0;
 }
 
 void ReceiverStats::UpdateStatistics(const RtpCastHeader& header) {
-  uint16 new_seq_num = header.webrtc.header.sequenceNumber;
+  const uint16 new_seq_num = header.sequence_number;
 
   if (interval_number_packets_ == 0) {
     // First packet in the interval.
     interval_min_sequence_number_ = new_seq_num;
   }
   if (total_number_packets_ == 0) {
     // First incoming packet.
     min_sequence_number_ = new_seq_num;
     max_sequence_number_ = new_seq_num;
   }
 
   if (IsNewerSequenceNumber(new_seq_num, max_sequence_number_)) {
     // Check wrap.
     if (new_seq_num < max_sequence_number_) {
       ++sequence_number_cycles_;
       ++interval_wrap_count_;
     }
     max_sequence_number_ = new_seq_num;
   }
 
   // Compute Jitter.
   base::TimeTicks now = clock_->NowTicks();
   base::TimeDelta delta_new_timestamp =
-      base::TimeDelta::FromMilliseconds(header.webrtc.header.timestamp);
+      base::TimeDelta::FromMilliseconds(header.rtp_timestamp);
   if (total_number_packets_ > 0) {
     // Update jitter.
     base::TimeDelta delta =
         (now - last_received_packet_time_) -
         ((delta_new_timestamp - last_received_timestamp_) / 90);
     jitter_ += (delta - jitter_) / 16;
   }
   last_received_timestamp_ = delta_new_timestamp;
   last_received_packet_time_ = now;
 
   // Increment counters.
   ++total_number_packets_;
   ++interval_number_packets_;
 }
 
 }  // namespace cast
 }  // namespace media