Update from https://crrev.com/312398

net/quic/test_tools/quic_config_peer.h

Index: net/quic/test_tools/quic_config_peer.h
diff --git a/net/quic/test_tools/quic_config_peer.h b/net/quic/test_tools/quic_config_peer.h
index 46726ebf333515d47452c37490b08d83a046d5a9..410c8182316bfa4c445a99a7bce107b480a68ac7 100644
--- a/net/quic/test_tools/quic_config_peer.h
+++ b/net/quic/test_tools/quic_config_peer.h
@@ -5,6 +5,7 @@
 #ifndef NET_QUIC_TEST_TOOLS_QUIC_CONFIG_PEER_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_CONFIG_PEER_H_
 
+#include "net/quic/quic_config.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
@@ -29,6 +30,8 @@ class QuicConfigPeer {
 
   static void SetReceivedBytesForConnectionId(QuicConfig* config, uint32 bytes);
 
+  static QuicTag CongestionFeedback(QuicConfig* config);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicConfigPeer);
 };