Let PacketRouter separate send and receive modules.

webrtc/video/video_send_stream.cc

Index: webrtc/video/video_send_stream.cc
diff --git a/webrtc/video/video_send_stream.cc b/webrtc/video/video_send_stream.cc
index 656bfb563a07415e42cde7ae757e37fda8fe43e0..f981d46ef2b163b5c6cdee15009dd83c1fb5bd28 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -824,7 +824,7 @@ VideoSendStreamImpl::VideoSendStreamImpl(
   // when sending padding, with the hope that the packet rate will be smaller,
   // and that it's more important to protect than the lower layers.
   for (RtpRtcp* rtp_rtcp : rtp_rtcp_modules_)
-    packet_router_->AddRtpModule(rtp_rtcp);
+    packet_router_->AddSendRtpModule(rtp_rtcp);
 
   for (size_t i = 0; i < config_->rtp.extensions.size(); ++i) {
     const std::string& extension = config_->rtp.extensions[i].uri;
@@ -903,7 +903,7 @@ VideoSendStreamImpl::~VideoSendStreamImpl() {
   remb_->RemoveRembSender(rtp_rtcp_modules_[0]);
 
   for (RtpRtcp* rtp_rtcp : rtp_rtcp_modules_) {
-    packet_router_->RemoveRtpModule(rtp_rtcp);
+    packet_router_->RemoveSendRtpModule(rtp_rtcp);
     delete rtp_rtcp;
   }
 }