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

media/cast/transport/rtp_sender/rtp_packetizer/test/rtp_header_parser.h

Index: media/cast/transport/rtp_sender/rtp_packetizer/test/rtp_header_parser.h
diff --git a/media/cast/transport/rtp_sender/rtp_packetizer/test/rtp_header_parser.h b/media/cast/transport/rtp_sender/rtp_packetizer/test/rtp_header_parser.h
index 61db5c662f0360a21c25773ff6596a34be30170d..bb6e0fae54b272600c674ea25d183ebed43d6204 100644
--- a/media/cast/transport/rtp_sender/rtp_packetizer/test/rtp_header_parser.h
+++ b/media/cast/transport/rtp_sender/rtp_packetizer/test/rtp_header_parser.h
@@ -13,6 +13,7 @@ namespace media {
 namespace cast {
 namespace transport {
 
+// TODO(miu): Kill this and use RtpCastHeader instead.
 struct RtpCastTestHeader {
   RtpCastTestHeader();
   ~RtpCastTestHeader();
@@ -36,6 +37,7 @@ struct RtpCastTestHeader {
   int header_length;
 };
 
+// TODO(miu): Kill this and use RtpParser instead.
 class RtpHeaderParser {
  public:
   RtpHeaderParser(const uint8* rtpData, size_t rtpDataLength);