Remove unused windowed RTT logic from RttStats

net/quic/core/congestion_control/rtt_stats.h

 // Copyright 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.
 //
 // A convenience class to store rtt samples and calculate smoothed rtt.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_
 #define NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_
 
 #include <stdint.h>
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
-#include "net/quic/core/congestion_control/windowed_filter.h"
 #include "net/quic/core/quic_bug_tracker.h"
 #include "net/quic/core/quic_protocol.h"
 #include "net/quic/core/quic_time.h"
 
 namespace net {
 
 namespace test {
 class RttStatsPeer;
 }  // namespace test
 
 class NET_EXPORT_PRIVATE RttStats {
  public:
   RttStats();
 
   // Updates the RTT from an incoming ack which is received |send_delta| after
   // the packet is sent and the peer reports the ack being delayed |ack_delay|.
   void UpdateRtt(QuicTime::Delta send_delta,
                  QuicTime::Delta ack_delay,
                  QuicTime now);
 
   // Causes the smoothed_rtt to be increased to the latest_rtt if the latest_rtt
   // is larger. The mean deviation is increased to the most recent deviation if
   // it's larger.
   void ExpireSmoothedMetrics();
 
-  // Forces RttStats to sample a new windowed min rtt within the next
-  // |num_samples| UpdateRtt calls.
-  void SampleNewWindowedMinRtt(uint32_t num_samples);
-
   // Called when connection migrates and rtt measurement needs to be reset.
   void OnConnectionMigration();
 
   // Returns the EWMA smoothed RTT for the connection.
   // May return Zero if no valid updates have occurred.
   QuicTime::Delta smoothed_rtt() const { return smoothed_rtt_; }
 
   // Returns the EWMA smoothed RTT prior to the most recent RTT sample.
   QuicTime::Delta previous_srtt() const { return previous_srtt_; }
 
@@ skipping 11 matching lines @@
   // The most recent rtt measurement.
   // May return Zero if no valid updates have occurred.
   QuicTime::Delta latest_rtt() const { return latest_rtt_; }
 
   // Returns the min_rtt for the entire connection.
   // May return Zero if no valid updates have occurred.
   QuicTime::Delta min_rtt() const { return min_rtt_; }
 
   QuicTime::Delta mean_deviation() const { return mean_deviation_; }
 
-  QuicTime::Delta WindowedMinRtt() { return windowed_min_rtt_.GetBest(); }
-
  private:
   friend class test::RttStatsPeer;
 
-  // Updates the windowed min rtt. Also forces a new windowed_min_rtt sample,
-  // if set by a call to SampleNewWindowedMinRtt() above.
-  void UpdateWindowedMinRtt(QuicTime::Delta rtt_sample, QuicTime now);
-
   QuicTime::Delta latest_rtt_;
   QuicTime::Delta min_rtt_;
   QuicTime::Delta smoothed_rtt_;
   QuicTime::Delta previous_srtt_;
   // Mean RTT deviation during this session.
   // Approximation of standard deviation, the error is roughly 1.25 times
   // larger than the standard deviation, for a normally distributed signal.
   QuicTime::Delta mean_deviation_;
   int64_t initial_rtt_us_;
 
-  // Variables used to force a new windowed_min_rtt measurement within
-  // num_samples_for_forced_min_.
-  QuicTime::Delta forced_windowed_min_rtt_;
-  QuicTime forced_windowed_min_rtt_time_;
-  uint32_t num_samples_for_forced_min_;
-
-  // Windowed min_rtt.
-  WindowedFilter<QuicTime::Delta,
-                 MinFilter<QuicTime::Delta>,
-                 QuicTime,
-                 QuicTime::Delta>
-      windowed_min_rtt_;
-
   DISALLOW_COPY_AND_ASSIGN(RttStats);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_