Delete deprecated PeerConnection methods, and corresponding using declarations.

webrtc/pc/peerconnection.cc

Index: webrtc/pc/peerconnection.cc
diff --git a/webrtc/pc/peerconnection.cc b/webrtc/pc/peerconnection.cc
index 3f01d69edffd6cee081e33a7d1613aca2f4af18d..c5d65918d9e0d6cd19418a917c3c7a65d1c19860 100644
--- a/webrtc/pc/peerconnection.cc
+++ b/webrtc/pc/peerconnection.cc
@@ -1363,9 +1363,6 @@ void PeerConnection::SetRemoteDescription(
   for (size_t i = 0; i < new_streams->count(); ++i) {
     MediaStreamInterface* new_stream = new_streams->at(i);
     stats_->AddStream(new_stream);
-    // Call both the raw pointer and scoped_refptr versions of the method
-    // for compatibility.
-    observer_->OnAddStream(new_stream);
     observer_->OnAddStream(
         rtc::scoped_refptr<MediaStreamInterface>(new_stream));
   }
@@ -2080,9 +2077,6 @@ void PeerConnection::UpdateEndedRemoteMediaStreams() {
 
   for (auto& stream : streams_to_remove) {
     remote_streams_->RemoveStream(stream);
-    // Call both the raw pointer and scoped_refptr versions of the method
-    // for compatibility.
-    observer_->OnRemoveStream(stream.get());
     observer_->OnRemoveStream(std::move(stream));
   }
 }
@@ -2257,9 +2251,6 @@ void PeerConnection::CreateRemoteRtpDataChannel(const std::string& label,
   channel->SetReceiveSsrc(remote_ssrc);
   rtc::scoped_refptr<DataChannelInterface> proxy_channel =
       DataChannelProxy::Create(signaling_thread(), channel);
-  // Call both the raw pointer and scoped_refptr versions of the method
-  // for compatibility.
-  observer_->OnDataChannel(proxy_channel.get());
   observer_->OnDataChannel(std::move(proxy_channel));
 }
 
@@ -2416,9 +2407,6 @@ void PeerConnection::OnDataChannelOpenMessage(
 
   rtc::scoped_refptr<DataChannelInterface> proxy_channel =
       DataChannelProxy::Create(signaling_thread(), channel);
-  // Call both the raw pointer and scoped_refptr versions of the method
-  // for compatibility.
-  observer_->OnDataChannel(proxy_channel.get());
   observer_->OnDataChannel(std::move(proxy_channel));
 }