Rename QUIC connection ID to server connection ID, part 2

This is part of a larger body of work required to enable client connection IDs.

gfe-relnote: n/a, code-rename-only change
PiperOrigin-RevId: 250386523
Change-Id: I20d5a688e040791eefda378f5246adfa770cef61
diff --git a/quic/test_tools/quic_test_client.cc b/quic/test_tools/quic_test_client.cc
index 9866a68..d4608ed 100644
--- a/quic/test_tools/quic_test_client.cc
+++ b/quic/test_tools/quic_test_client.cc
@@ -209,8 +209,8 @@
                                                                this),
           QuicWrapUnique(
               new RecordingProofVerifier(std::move(proof_verifier)))),
-      override_connection_id_(EmptyQuicConnectionId()),
-      connection_id_overridden_(false) {}
+      override_server_connection_id_(EmptyQuicConnectionId()),
+      server_connection_id_overridden_(false) {}
 
 MockableQuicClient::~MockableQuicClient() {
   if (connected()) {
@@ -231,13 +231,15 @@
 }
 
 QuicConnectionId MockableQuicClient::GenerateNewConnectionId() {
-  return connection_id_overridden_ ? override_connection_id_
-                                   : QuicClient::GenerateNewConnectionId();
+  return server_connection_id_overridden_
+             ? override_server_connection_id_
+             : QuicClient::GenerateNewConnectionId();
 }
 
-void MockableQuicClient::UseConnectionId(QuicConnectionId connection_id) {
-  connection_id_overridden_ = true;
-  override_connection_id_ = connection_id;
+void MockableQuicClient::UseConnectionId(
+    QuicConnectionId server_connection_id) {
+  server_connection_id_overridden_ = true;
+  override_server_connection_id_ = server_connection_id;
 }
 
 void MockableQuicClient::UseWriter(QuicPacketWriterWrapper* writer) {
@@ -749,9 +751,9 @@
   client_->UseWriter(writer);
 }
 
-void QuicTestClient::UseConnectionId(QuicConnectionId connection_id) {
+void QuicTestClient::UseConnectionId(QuicConnectionId server_connection_id) {
   DCHECK(!connected());
-  client_->UseConnectionId(connection_id);
+  client_->UseConnectionId(server_connection_id);
 }
 
 bool QuicTestClient::MigrateSocket(const QuicIpAddress& new_host) {