Refactor to create a new LossDetectionInterface used by the

net/quic/congestion_control/tcp_loss_algorithm.h

Index: net/quic/congestion_control/tcp_loss_algorithm.h
diff --git a/net/quic/congestion_control/tcp_loss_algorithm.h b/net/quic/congestion_control/tcp_loss_algorithm.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d280e8517494dcd604aab119d92f3c0d8754101
--- /dev/null
+++ b/net/quic/congestion_control/tcp_loss_algorithm.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_
+#define NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_
+
+#include <algorithm>
+#include <map>
+
+#include "base/basictypes.h"
+#include "net/quic/congestion_control/loss_detection_interface.h"
+#include "net/quic/quic_protocol.h"
+#include "net/quic/quic_time.h"
+#include "net/quic/quic_unacked_packet_map.h"
+
+namespace net {
+
+// Class which implement's TCP's approach of losing packets when 3 nacks have
+// been received for a packet.  Also implements TCP's early retransmit(RFC5827).
+class NET_EXPORT_PRIVATE TCPLossAlgorithm : public LossDetectionInterface {
+ public:
+  TCPLossAlgorithm();
+  virtual ~TCPLossAlgorithm() {}
+
+  // Uses nack counts to decide when packets are lost.
+  virtual SequenceNumberSet DetectLostPackets(
+      const QuicUnackedPacketMap& unacked_packets,
+      const QuicTime& time,
+      QuicPacketSequenceNumber largest_observed,
+      QuicTime::Delta srtt) OVERRIDE;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CONGESTION_CONTROL_TCP_LOSS_ALGORITHM_H_