Convert a few lingering DFATALs to QUIC_BUG. Not flag protected.

net/quic/core/quic_packet_creator.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_packet_creator.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 300 matching lines @@
   // Only preserve the original encryption level if it's a handshake packet or
   // if we haven't gone forward secure.
   if (retransmission.has_crypto_handshake ||
       packet_.encryption_level != ENCRYPTION_FORWARD_SECURE) {
     packet_.encryption_level = retransmission.encryption_level;
   }
 
   // Serialize the packet and restore packet number length state.
   for (const QuicFrame& frame : retransmission.retransmittable_frames) {
     bool success = AddFrame(frame, false);
-    LOG_IF(DFATAL, !success)
-        << " Failed to add frame of type:" << frame.type
-        << " num_frames:" << retransmission.retransmittable_frames.size()
-        << " retransmission.packet_number_length:"
-        << retransmission.packet_number_length
-        << " packet_.packet_number_length:" << packet_.packet_number_length;
+    QUIC_BUG_IF(!success) << " Failed to add frame of type:" << frame.type
+                          << " num_frames:"
+                          << retransmission.retransmittable_frames.size()
+                          << " retransmission.packet_number_length:"
+                          << retransmission.packet_number_length
+                          << " packet_.packet_number_length:"
+                          << packet_.packet_number_length;
   }
   SerializePacket(buffer, buffer_len);
   packet_.original_path_id = retransmission.path_id;
   packet_.original_packet_number = retransmission.packet_number;
   packet_.transmission_type = retransmission.transmission_type;
   OnSerializedPacket();
   // Restore old values.
   if (!FLAGS_quic_simple_packet_number_length) {
     // OnSerializedPacket updates the packet_number_length, so it's incorrect to
     // restore it here.
@@ skipping 381 matching lines @@
   if (bit_mask_ == 0) {
     bit_bucket_ = random_->RandUint64();
     bit_mask_ = 1;
   }
   bool result = ((bit_bucket_ & bit_mask_) != 0);
   bit_mask_ <<= 1;
   return result;
 }
 
 }  // namespace net