Update from https://crrev.com/306655

net/quic/congestion_control/cubic.cc

Index: net/quic/congestion_control/cubic.cc
diff --git a/net/quic/congestion_control/cubic.cc b/net/quic/congestion_control/cubic.cc
index eaec6218ff4a0b23736feb0503fa0f6e4679123c..55ce8037cedb0c8ede254df8023f89286814f61a 100644
--- a/net/quic/congestion_control/cubic.cc
+++ b/net/quic/congestion_control/cubic.cc
@@ -161,8 +161,8 @@ QuicPacketCount Cubic::CongestionWindowAfterAck(
   // suddenly, leading to more than one iteration through the following loop.
   while (true) {
     // Update estimated TCP congestion_window.
-    uint32 required_ack_count =
-        estimated_tcp_congestion_window_ / Alpha();
+    QuicPacketCount required_ack_count = static_cast<QuicPacketCount>(
+        estimated_tcp_congestion_window_ / Alpha());
     if (acked_packets_count_ < required_ack_count) {
       break;
     }