cast: Split Rtcp into two for sender and receiver

media/cast/sender/video_sender_unittest.cc

Index: media/cast/sender/video_sender_unittest.cc
diff --git a/media/cast/sender/video_sender_unittest.cc b/media/cast/sender/video_sender_unittest.cc
index 60f15a5b70618b50f04dd743e5dce4c7e2523241..9f9091fca51e0d16f42998ddd1014b22756b5315 100644
--- a/media/cast/sender/video_sender_unittest.cc
+++ b/media/cast/sender/video_sender_unittest.cc
@@ -59,7 +59,7 @@ class TestPacketSender : public PacketSender {
       callback_ = cb;
       return false;
     }
-    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