LibWeb: Make TextMetrics GC-allocated

Author: https://github.com/awesomekling
Commit: 6b7a1d13e9
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/HTML/TextMetrics.cpp

@@ -4,13 +4,23 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include "TextMetrics.h"
+#include <LibWeb/Bindings/TextMetricsPrototype.h>
+#include <LibWeb/HTML/TextMetrics.h>
+#include <LibWeb/HTML/Window.h>
 
 namespace Web::HTML {
 
-RefPtr<TextMetrics> TextMetrics::create()
+JS::NonnullGCPtr<TextMetrics> TextMetrics::create(HTML::Window& window)
 {
-    return adopt_ref(*new TextMetrics());
+    return *window.heap().allocate<TextMetrics>(window.realm(), window);
 }
 
+TextMetrics::TextMetrics(HTML::Window& window)
+    : PlatformObject(window.realm())
+{
+    set_prototype(&window.ensure_web_prototype<Bindings::TextMetricsPrototype>("TextMetrics"));
+}
+
+TextMetrics::~TextMetrics() = default;
+
 }