[dart:js] Use Array.isArray

Bug: b/411647888
Change-Id: I501808ab48798e99531114017ad3497d1f0ab2c4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/423067
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Commit-Queue: Stephen Adams <sra@google.com>

sdk/lib/_internal/js_dev_runtime/patch/js_patch.dart

@@ -440,7 +440,7 @@ JsObject _wrapToDartHelper(Object o) {
   if (JS<bool>('!', 'typeof # == "function"', o)) {
     return JsFunction._fromJs(o);
   }
-  if (JS<bool>('!', '# instanceof Array', o)) {
+  if (JS<bool>('!', 'Array.isArray(#)', o)) {
     return JsArray._fromJs(o);
   }
   return JsObject._fromJs(o);

sdk/lib/_internal/js_runtime/lib/js_patch.dart

@@ -548,7 +548,7 @@ Object _wrapToDart(o) {
       (o) => JsFunction._fromJs(o),
     );
   }
-  if (JS('bool', '# instanceof Array', o)) {
+  if (JS('bool', 'Array.isArray(#)', o)) {
     return _getDartProxy(
       o,
       _DART_OBJECT_PROPERTY_NAME,