Userland: Migrate to argument-less deferred_invoke

Only one place used this argument and it was to hold on to a strong ref
for the object. Since we already do that now, there's no need to keep
this argument around since this can be easily captured.

This commit contains no changes.

Userland/Services/SQLServer/DatabaseConnection.cpp

@@ -38,7 +38,7 @@ DatabaseConnection::DatabaseConnection(String database_name, int client_id)
 
     dbgln_if(SQLSERVER_DEBUG, "DatabaseConnection {} initiating connection with database '{}'", connection_id(), m_database_name);
     s_connections.set(m_connection_id, *this);
-    deferred_invoke([&](Object&) {
+    deferred_invoke([&] {
         m_database = SQL::Database::construct(String::formatted("/home/anon/sql/{}.db", m_database_name));
         m_accept_statements = true;
         auto client_connection = ClientConnection::client_connection_for(m_client_id);
@@ -53,7 +53,7 @@ void DatabaseConnection::disconnect()
 {
     dbgln_if(SQLSERVER_DEBUG, "DatabaseConnection::disconnect(connection_id {}, database '{}'", connection_id(), m_database_name);
     m_accept_statements = false;
-    deferred_invoke([&](Object&) {
+    deferred_invoke([&] {
         m_database = nullptr;
         s_connections.remove(m_connection_id);
         auto client_connection = ClientConnection::client_connection_for(client_id());

Userland/Services/SQLServer/SQLStatement.cpp

@@ -60,7 +60,7 @@ void SQLStatement::execute()
         return;
     }
 
-    deferred_invoke([&](Object&) {
+    deferred_invoke([&] {
         auto maybe_error = parse();
         if (maybe_error.has_value()) {
             report_error(maybe_error.value());
@@ -107,7 +107,7 @@ void SQLStatement::next()
     if (m_index < m_result->results().size()) {
         auto& tuple = m_result->results()[m_index++];
         client_connection->async_next_result(statement_id(), tuple.to_string_vector());
-        deferred_invoke([&](Object&) {
+        deferred_invoke([&] {
             next();
         });
     } else {

Userland/Services/WebServer/Client.cpp

@@ -36,10 +36,7 @@ Client::Client(NonnullRefPtr<Core::TCPSocket> socket, Core::Object* parent)
 
 void Client::die()
 {
-    deferred_invoke([this](auto& object) {
-        NonnullRefPtr protector { object };
-        remove_from_parent();
-    });
+    deferred_invoke([this] { remove_from_parent(); });
 }
 
 void Client::start()

Userland/Services/WebSocket/ClientConnection.cpp

@@ -126,7 +126,7 @@ void ClientConnection::did_error(i32 connection_id, i32 message)
 void ClientConnection::did_close(i32 connection_id, u16 code, String reason, bool was_clean)
 {
     async_closed(connection_id, code, reason, was_clean);
-    deferred_invoke([this, connection_id](auto&) {
+    deferred_invoke([this, connection_id] {
         m_connections.remove(connection_id);
     });
 }

Userland/Services/WindowServer/ClientConnection.cpp

@@ -79,7 +79,7 @@ ClientConnection::~ClientConnection()
 
 void ClientConnection::die()
 {
-    deferred_invoke([this](auto&) {
+    deferred_invoke([this] {
         s_connections->remove(client_id());
     });
 }

Userland/Services/WindowServer/WMClientConnection.cpp

@@ -28,7 +28,7 @@ WMClientConnection::~WMClientConnection()
 
 void WMClientConnection::die()
 {
-    deferred_invoke([this](auto&) {
+    deferred_invoke([this] {
         s_connections.remove(client_id());
     });
 }

Userland/Services/WindowServer/Window.cpp

@@ -764,7 +764,7 @@ void Window::request_update(const Gfx::IntRect& rect, bool ignore_occlusion)
     if (rect.is_empty())
         return;
     if (m_pending_paint_rects.is_empty()) {
-        deferred_invoke([this, ignore_occlusion](auto&) {
+        deferred_invoke([this, ignore_occlusion] {
             client()->post_paint_message(*this, ignore_occlusion);
         });
     }