cast: Split Rtcp into two for sender and receiver

media/cast/sender/audio_sender_unittest.cc

Index: media/cast/sender/audio_sender_unittest.cc
diff --git a/media/cast/sender/audio_sender_unittest.cc b/media/cast/sender/audio_sender_unittest.cc
index 68199281238d05bd4bc0a3f8b20e8d2725e63257..af6b9c462d1568b77432432d9d75f275530800e5 100644
--- a/media/cast/sender/audio_sender_unittest.cc
+++ b/media/cast/sender/audio_sender_unittest.cc
@@ -42,7 +42,7 @@ class TestPacketSender : public PacketSender {
   TestPacketSender() : number_of_rtp_packets_(0), number_of_rtcp_packets_(0) {}
 
   bool SendPacket(PacketRef packet, const base::Closure& cb) final {
-    if (Rtcp::IsRtcpPacket(&packet->data[0], packet->data.size())) {
+    if (IsRtcpPacket(&packet->data[0], packet->data.size())) {
       ++number_of_rtcp_packets_;
     } else {
       // Check that at least one RTCP packet was sent before the first RTP