Added DISALLOW_COPY_AND_ASSIGN to disable copy/assign.

net/quic/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 <algorithm>
@@ skipping 40 matching lines @@
 
  private:
   QuicTime::Delta latest_rtt_;
   QuicTime::Delta min_rtt_;
   QuicTime::Delta smoothed_rtt_;
   // 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 initial_rtt_us_;
+
+  DISALLOW_COPY_AND_ASSIGN(RttStats);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_