Use LOG_IF instead of LOG_IF_FIRST_N in a few places, as per avd's

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 5ce6608b1dab01823ed78382bcad41f036cf8367..9d641310937266e9aa182931f6ac127d806bd580 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -316,15 +316,11 @@ void QuicSentPacketManager::MarkForRetransmission(
     TransmissionType transmission_type) {
   TransmissionInfo* transmission_info =
       FindOrNull(unacked_packets_, sequence_number);
-  if (transmission_info == NULL) {
-    LOG(DFATAL) << "transmission_info == NULL";
+  if (transmission_info != NULL) {
+    LOG_IF(DFATAL, transmission_info->retransmittable_frames == NULL);
+    LOG_IF(DFATAL, transmission_info->sent_time == QuicTime::Zero());
   } else {
-    if (transmission_info->retransmittable_frames == NULL) {
-      LOG(DFATAL) << "transmission_info->retransmittable_frames == NULL";
-    }
-    if (transmission_info->sent_time == QuicTime::Zero()) {
-      LOG(DFATAL) << "transmission_info->sent_time == QuicTime::Zero()";
-    }
+    LOG(DFATAL) << "Unable to retansmit packet: " << sequence_number;
   }
   // TODO(ianswett): Currently the RTO can fire while there are pending NACK
   // retransmissions for the same data, which is not ideal.