Fix check in proto_to_packet_translator to make sure packets are long enough

gfe-relnote: n/a (test-only change)
PiperOrigin-RevId: 257033088
Change-Id: I2090e388dbf637300297a5ffe7531f0f9fa7a7f5

quic/core/quic_packet_creator.cc

diff --git a/quic/core/quic_packet_creator.cc b/quic/core/quic_packet_creator.cc
index 00dbaf0..a8d3291 100644
--- a/quic/core/quic_packet_creator.cc
+++ b/quic/core/quic_packet_creator.cc
@@ -1142,6 +1142,7 @@
          packet_.encryption_level < ENCRYPTION_FORWARD_SECURE;
 }
 
+// static
 size_t QuicPacketCreator::MinPlaintextPacketSize(
     const ParsedQuicVersion& version) {
   if (!version.HasHeaderProtection()) {