LibWeb: Clean up shadow root of meter element

Author: https://github.com/bplaat
Commit: ca94df3c88
Pull-request: https://github.com/SerenityOS/serenity/pull/22176

Userland/Libraries/LibWeb/HTML/HTMLMeterElement.cpp

@@ -5,7 +5,6 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/ShadowRoot.h>
 #include <LibWeb/HTML/HTMLMeterElement.h>
@@ -188,6 +187,11 @@ void HTMLMeterElement::inserted()
     create_shadow_tree_if_needed();
 }
 
+void HTMLMeterElement::removed_from(DOM::Node*)
+{
+    set_shadow_root(nullptr);
+}
+
 void HTMLMeterElement::create_shadow_tree_if_needed()
 {
     if (shadow_root_internal())