Revert of relnote: Protect against a QUIC crash bug but logging a DFATAL and

net/quic/quic_packet_creator.cc

Index: net/quic/quic_packet_creator.cc
diff --git a/net/quic/quic_packet_creator.cc b/net/quic/quic_packet_creator.cc
index 7474b0b17b75bd1f3ebc8cea4b7f683583989e93..a8afaa7c4a31c0a89e941f95bdd7e3dd0deef7f5 100644
--- a/net/quic/quic_packet_creator.cc
+++ b/net/quic/quic_packet_creator.cc
@@ -463,11 +463,8 @@
     packet.reset(framer_->BuildDataPacket(header, queued_frames_,
                                           large_buffer.get(), packet_size_));
   }
-  if (packet == nullptr) {
-    LOG(DFATAL) << "Failed to serialize " << queued_frames_.size()
-                << " frames.";
-    return NoPacket();
-  }
+  LOG_IF(DFATAL, packet == nullptr) << "Failed to serialize "
+                                    << queued_frames_.size() << " frames.";
 
   OnBuiltFecProtectedPayload(header, packet->FecProtectedData());