Update from https://crrev.com/306655

net/quic/congestion_control/rtt_stats.cc

Index: net/quic/congestion_control/rtt_stats.cc
diff --git a/net/quic/congestion_control/rtt_stats.cc b/net/quic/congestion_control/rtt_stats.cc
index 32e3b58a8aad722e20e08750ece8ef486f68c217..6c2687df5646ff6c1e3eb5e27f4f4e74367befea 100644
--- a/net/quic/congestion_control/rtt_stats.cc
+++ b/net/quic/congestion_control/rtt_stats.cc
@@ -79,9 +79,9 @@ void RttStats::UpdateRtt(QuicTime::Delta send_delta,
     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()