Allow receiving a QUIC CongestionFeedbackFrame that is not kTCP.

net/quic/congestion_control/tcp_cubic_sender.cc

Index: net/quic/congestion_control/tcp_cubic_sender.cc
diff --git a/net/quic/congestion_control/tcp_cubic_sender.cc b/net/quic/congestion_control/tcp_cubic_sender.cc
index dd7e7aee5c31f7a98cb3a8a2ad82e4255dd63a86..bd61bdb916ec3c7f2cb50beb9418e58fb829749d 100644
--- a/net/quic/congestion_control/tcp_cubic_sender.cc
+++ b/net/quic/congestion_control/tcp_cubic_sender.cc
@@ -68,7 +68,9 @@ void TcpCubicSender::SetFromConfig(const QuicConfig& config, bool is_server) {
 void TcpCubicSender::OnIncomingQuicCongestionFeedbackFrame(
     const QuicCongestionFeedbackFrame& feedback,
     QuicTime feedback_receive_time) {
-  receive_window_ = feedback.tcp.receive_window;
+  if (feedback.type == kTCP) {
+    receive_window_ = feedback.tcp.receive_window;
+  }
 }
 
 void TcpCubicSender::OnCongestionEvent(