Update from https://crrev.com/306655

net/quic/congestion_control/rtt_stats.cc

 // 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.
 
 #include "net/quic/congestion_control/rtt_stats.h"
 
 #include <complex>  // std::abs
 
 using std::max;
 
@@ skipping 61 matching lines @@
   if (rtt_sample > ack_delay) {
     rtt_sample = rtt_sample.Subtract(ack_delay);
   }
   latest_rtt_ = rtt_sample;
   // First time call.
   if (smoothed_rtt_.IsZero()) {
     smoothed_rtt_ = rtt_sample;
     mean_deviation_ = QuicTime::Delta::FromMicroseconds(
         rtt_sample.ToMicroseconds() / 2);
   } else {
-    mean_deviation_ = QuicTime::Delta::FromMicroseconds(
+    mean_deviation_ = QuicTime::Delta::FromMicroseconds(static_cast<int64>(
         kOneMinusBeta * mean_deviation_.ToMicroseconds() +
-        kBeta * std::abs(smoothed_rtt_.Subtract(rtt_sample).ToMicroseconds()));
+        kBeta * std::abs(smoothed_rtt_.Subtract(rtt_sample).ToMicroseconds())));
     smoothed_rtt_ = smoothed_rtt_.Multiply(kOneMinusAlpha).Add(
         rtt_sample.Multiply(kAlpha));
     DVLOG(1) << " smoothed_rtt(us):" << smoothed_rtt_.ToMicroseconds()
              << " mean_deviation(us):" << mean_deviation_.ToMicroseconds();
   }
 }
 
 void RttStats::UpdateRecentMinRtt(QuicTime::Delta rtt_sample, QuicTime now) {
   // Recent min_rtt update.
   if (num_min_rtt_samples_remaining_ > 0) {
@@ skipping 26 matching lines @@
       now.Subtract(recent_min_rtt_window_.Multiply(kHalfWindow))) {
     half_window_rtt_ = quarter_window_rtt_;
     quarter_window_rtt_ = RttSample(rtt_sample, now);
   } else if (quarter_window_rtt_.time <
       now.Subtract(recent_min_rtt_window_.Multiply(kQuarterWindow))) {
     quarter_window_rtt_ = RttSample(rtt_sample, now);
   }
 }
 
 }  // namespace net