Cast: Remove unused RTCP messages

media/cast/net/rtcp/rtcp_defines.cc

Index: media/cast/net/rtcp/rtcp_defines.cc
diff --git a/media/cast/net/rtcp/rtcp_defines.cc b/media/cast/net/rtcp/rtcp_defines.cc
index 9012468c07e539b6c5d60d8ce0acba68a70f778e..3346f45c10f4cf6325384a349e8ea1bbac9bd6b4 100644
--- a/media/cast/net/rtcp/rtcp_defines.cc
+++ b/media/cast/net/rtcp/rtcp_defines.cc
@@ -23,16 +23,9 @@ RtcpReceiverFrameLogMessage::RtcpReceiverFrameLogMessage(uint32 timestamp)
     : rtp_timestamp_(timestamp) {}
 RtcpReceiverFrameLogMessage::~RtcpReceiverFrameLogMessage() {}
 
-RtcpRpsiMessage::RtcpRpsiMessage()
-    : remote_ssrc(0u), payload_type(0u), picture_id(0u) {}
-RtcpRpsiMessage::~RtcpRpsiMessage() {}
-
 RtcpNackMessage::RtcpNackMessage() : remote_ssrc(0u) {}
 RtcpNackMessage::~RtcpNackMessage() {}
 
-RtcpRembMessage::RtcpRembMessage() : remb_bitrate(0u) {}
-RtcpRembMessage::~RtcpRembMessage() {}
-
 RtcpReceiverReferenceTimeReport::RtcpReceiverReferenceTimeReport()
     : remote_ssrc(0u), ntp_seconds(0u), ntp_fraction(0u) {}
 RtcpReceiverReferenceTimeReport::~RtcpReceiverReferenceTimeReport() {}