message: Fix function declaration
  Summary: Fix function declaration, to match function: diffusion/FBS/browse/master/fbcode/quic/logging/QLogger.cpp$260
diff: @@ -38,7 +38,7 @@ std::unique_ptr<QLogPacketEvent> createPacketEvent(
  std::unique_ptr<QLogVersionNegotiationEvent> createPacketEvent(
  const VersionNegotiationPacket& versionPacket,
  - size_t packetSize,
  + uint64_t packetSize,
  bool isPacketRecvd);
  } // namespace quic
  