Rename connection_id to server_connection_id

This is a step on the way to enabling client connection IDs. It will make the code less ambiguous once we introduce client_connection_id.

gfe-relnote: n/a, renaming code only
PiperOrigin-RevId: 249045070
Change-Id: Ia7ba75511f96c896bc6f0f4978dae2cd13e707fb
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index 4ecb780..0d09430 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -938,7 +938,7 @@
       peer_creator_.SetEncrypter(
           level, QuicMakeUnique<NullEncrypter>(peer_framer_.perspective()));
     }
-    QuicFramerPeer::SetLastSerializedConnectionId(
+    QuicFramerPeer::SetLastSerializedServerConnectionId(
         QuicConnectionPeer::GetFramer(&connection_), connection_id_);
     if (version().transport_version > QUIC_VERSION_43) {
       EXPECT_TRUE(QuicConnectionPeer::GetNoStopWaitingFrames(&connection_));