Fix MSAN error in ChatClient.

Thanks to new function calls on teardown, members are no longer declared in the proper order.

PiperOrigin-RevId: 814293891

quiche/quic/moqt/tools/chat_client.cc

diff --git a/quiche/quic/moqt/tools/chat_client.cc b/quiche/quic/moqt/tools/chat_client.cc
index 111e83b..fd6a7f6 100644
--- a/quiche/quic/moqt/tools/chat_client.cc
+++ b/quiche/quic/moqt/tools/chat_client.cc
@@ -96,8 +96,8 @@
                        absl::string_view localhost,
                        quic::QuicEventLoop* event_loop)
     : my_track_name_(ConstructTrackName(chat_id, username, localhost)),
-      event_loop_(event_loop),
       remote_track_visitor_(this),
+      event_loop_(event_loop),
       interface_(std::move(interface)) {
   if (event_loop_ == nullptr) {
     quic::QuicDefaultClock* clock = quic::QuicDefaultClock::Get();

quiche/quic/moqt/tools/chat_client.h

diff --git a/quiche/quic/moqt/tools/chat_client.h b/quiche/quic/moqt/tools/chat_client.h
index b7ed5a6..c46769a 100644
--- a/quiche/quic/moqt/tools/chat_client.h
+++ b/quiche/quic/moqt/tools/chat_client.h
@@ -139,6 +139,10 @@
   // Basic session information
   FullTrackName my_track_name_;
 
+  // Related to subscriptions/publish_namespaces
+  // TODO: One for each subscribe
+  RemoteTrackVisitor remote_track_visitor_;
+
   // General state variables
   // The event loop to use for this client.
   quic::QuicEventLoop* event_loop_;
@@ -155,9 +159,6 @@
   absl::flat_hash_set<FullTrackName> other_users_;
   int subscribes_to_make_ = 0;
 
-  // Related to subscriptions/publish_namespaces
-  // TODO: One for each subscribe
-  RemoteTrackVisitor remote_track_visitor_;
 
   // Handling outgoing messages
   std::shared_ptr<moqt::MoqtOutgoingQueue> queue_;