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 edbee2ec7d944f0a99a57c6ce2d670914b96a0f9..c88312902d364fbb41f8c84cb139564ade23531a 100644
--- a/media/cast/sender/audio_sender_unittest.cc
+++ b/media/cast/sender/audio_sender_unittest.cc
@@ -39,7 +39,7 @@ 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