Disable connection migration if disabled in config sent by server.

net/quic/test_tools/quic_config_peer.cc

Index: net/quic/test_tools/quic_config_peer.cc
diff --git a/net/quic/test_tools/quic_config_peer.cc b/net/quic/test_tools/quic_config_peer.cc
index 84fa19007cea8d347e9af1d352854c6a087bbe82..6c0daa70ecae3c2d969a09f55660ba4445bd2ed7 100644
--- a/net/quic/test_tools/quic_config_peer.cc
+++ b/net/quic/test_tools/quic_config_peer.cc
@@ -45,5 +45,10 @@ void QuicConfigPeer::SetReceivedBytesForConnectionId(QuicConfig* config,
   config->bytes_for_connection_id_.SetReceivedValue(bytes);
 }
 
+// static
+void QuicConfigPeer::SetReceivedDisableConnectionMigration(QuicConfig* config) {
+  config->connection_migration_disabled_.SetReceivedValue(1);
+}
+
 }  // namespace test
 }  // namespace net