LibWeb: Convert trivial attributes to FrozenArray

Author: https://github.com/trflynn89
Commit: ad34fdad48
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4473
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/HTML/DataTransfer.idl

@@ -14,7 +14,7 @@ interface DataTransfer {
     [FIXME] undefined setDragImage(Element image, long x, long y);
 
     // old interface
-    readonly attribute sequence<DOMString> types; // FIXME: This should be FrozenArray<DOMString>
+    readonly attribute FrozenArray<DOMString> types;
     DOMString getData(DOMString format);
     [FIXME] undefined setData(DOMString format, DOMString data);
     [FIXME] undefined clearData(optional DOMString format);

Libraries/LibWeb/HTML/NavigatorLanguage.idl

@@ -1,7 +1,6 @@
 // https://html.spec.whatwg.org/multipage/system-state.html#navigatorlanguage
 interface mixin NavigatorLanguage {
     readonly attribute DOMString language;
-    // FIXME: readonly attribute FrozenArray<DOMString> languages;
-    //        This is supposed to be a FrozenArray that always returns the same object
-    readonly attribute sequence<DOMString> languages;
+    // FIXME: This is supposed always return the same object
+    readonly attribute FrozenArray<DOMString> languages;
 };