QUIC - minor clean up changes found while merging changes into internal

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index b7b28c48de020d88856cca7b2a1dd6a872a75706..a89c02e9cd56d5bcef1dddd832b23232b0353b52 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -876,9 +876,8 @@ const QuicTime QuicSentPacketManager::GetRetransmissionTime() const {
       QuicTime rto_timeout = sent_time.Add(GetRetransmissionDelay());
       return QuicTime::Max(min_timeout, rto_timeout);
     }
-    default:
-      DCHECK(false);
   }
+  DCHECK(false);
   return QuicTime::Zero();
 }