LibWeb: Remove DOM element deprecated_get_attribute()

Author: https://github.com/bplaat
Commit: a681429dff
Pull-request: https://github.com/SerenityOS/serenity/pull/22777
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/shannonbooth ✅

Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp

@@ -193,9 +193,10 @@ Optional<ARIA::Role> HTMLSelectElement::default_role() const
     if (has_attribute(AttributeNames::multiple))
         return ARIA::Role::listbox;
     if (has_attribute(AttributeNames::size)) {
-        auto size_attribute = deprecated_attribute(AttributeNames::size).to_number<int>();
-        if (size_attribute.has_value() && size_attribute.value() > 1)
-            return ARIA::Role::listbox;
+        if (auto size_string = get_attribute(HTML::AttributeNames::size); size_string.has_value()) {
+            if (auto size = size_string->to_number<int>(); size.has_value() && *size > 1)
+                return ARIA::Role::listbox;
+        }
     }
     // https://www.w3.org/TR/html-aria/#el-select
     return ARIA::Role::combobox;