Cache the value of GetMaxPlaintextSize in QuicPacketCreator. No functional change.

net/quic/quic_packet_generator.cc

Index: net/quic/quic_packet_generator.cc
diff --git a/net/quic/quic_packet_generator.cc b/net/quic/quic_packet_generator.cc
index 57495678d94371b7e335b71d121c240b5857537b..d0a3fc64a2e526f38c67c7d8adb86e8d2edcbaeb 100644
--- a/net/quic/quic_packet_generator.cc
+++ b/net/quic/quic_packet_generator.cc
@@ -420,7 +420,7 @@ QuicByteCount QuicPacketGenerator::max_packet_length() const {
 }
 
 void QuicPacketGenerator::set_max_packet_length(QuicByteCount length) {
-  packet_creator_.set_max_packet_length(length);
+  packet_creator_.SetMaxPacketLength(length);
 }
 
 QuicEncryptedPacket* QuicPacketGenerator::SerializeVersionNegotiationPacket(
@@ -458,4 +458,9 @@ void QuicPacketGenerator::set_encryption_level(EncryptionLevel level) {
   packet_creator_.set_encryption_level(level);
 }
 
+void QuicPacketGenerator::SetEncrypter(EncryptionLevel level,
+                                       QuicEncrypter* encrypter) {
+  packet_creator_.SetEncrypter(level, encrypter);
+}
+
 }  // namespace net