Change QUIC's Reno congestion controller to use a higher beta. Fixed

net/quic/congestion_control/tcp_cubic_sender.cc

Index: net/quic/congestion_control/tcp_cubic_sender.cc
diff --git a/net/quic/congestion_control/tcp_cubic_sender.cc b/net/quic/congestion_control/tcp_cubic_sender.cc
index 9ea96aed5f5b171c0c6e60ecb4c9d02b76897f51..c55d6205ef0d71098fa26af46b3434e79f048b11 100644
--- a/net/quic/congestion_control/tcp_cubic_sender.cc
+++ b/net/quic/congestion_control/tcp_cubic_sender.cc
@@ -24,6 +24,7 @@ const QuicPacketCount kMinimumCongestionWindow = 2;
 const QuicByteCount kMaxSegmentSize = kDefaultTCPMSS;
 const int64 kInitialCongestionWindow = 10;
 const int kMaxBurstLength = 3;
+const float kRenoBeta = 0.7f;  // Reno backoff factor.
 }  // namespace
 
 TcpCubicSender::TcpCubicSender(
@@ -133,7 +134,7 @@ void TcpCubicSender::OnPacketLost(QuicPacketSequenceNumber sequence_number,
   prr_.OnPacketLost(bytes_in_flight);
 
   if (reno_) {
-    congestion_window_ = congestion_window_ >> 1;
+    congestion_window_ = congestion_window_ * kRenoBeta;
   } else {
     congestion_window_ =
         cubic_.CongestionWindowAfterPacketLoss(congestion_window_);