gfe-relnote: Do not send connection close when client receives a version negotiation packet. Not affect prod, not protected.

PiperOrigin-RevId: 274017599
Change-Id: Ifddd78e1f9efaa655cb401a404bd634c88d26847

quic/core/quic_connection.cc

diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index 7d29b86..6ebc20b 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -629,7 +629,7 @@
           ParsedQuicVersionVectorToString(framer_.supported_versions()),
           "}, peer supported versions: {",
           ParsedQuicVersionVectorToString(packet.versions), "}"),
-      ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
+      ConnectionCloseBehavior::SILENT_CLOSE);
 }
 
 // Handles retry for client connection.

quic/core/quic_connection_test.cc

diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index 68ba446..97119e8 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -7016,6 +7016,8 @@
       ConstructReceivedPacket(*encrypted, QuicTime::Zero()));
   EXPECT_CALL(visitor_, OnConnectionClosed(_, ConnectionCloseSource::FROM_SELF))
       .WillOnce(Invoke(this, &QuicConnectionTest::SaveConnectionCloseFrame));
+  // Verify no connection close packet gets sent.
+  EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(0);
   connection_.ProcessUdpPacket(kSelfAddress, kPeerAddress, *received);
   EXPECT_FALSE(connection_.connected());
   EXPECT_EQ(1, connection_close_frame_count_);