Remove TreatNullAs=NullString for HTMLScriptElement

LayoutTests/fast/dom/element-attribute-js-null.html

Index: LayoutTests/fast/dom/element-attribute-js-null.html
diff --git a/LayoutTests/fast/dom/element-attribute-js-null.html b/LayoutTests/fast/dom/element-attribute-js-null.html
index 850191ee6ff319863493a1f42de08753d5f9b443..5de2923f121d076c8745c3897970d7549d7a99f4 100644
--- a/LayoutTests/fast/dom/element-attribute-js-null.html
+++ b/LayoutTests/fast/dom/element-attribute-js-null.html
@@ -500,12 +500,14 @@
                     type: 'HTMLScriptElement',
                     elementToUse: document.createElement('script'),
                     attributes: [
-                        {name: 'text', expectedNull: ''},
-                        {name: 'htmlFor', expectedNull: ''},
-                        {name: 'event', expectedNull: ''},
-                        {name: 'charset', expectedNull: ''},
-                        {name: 'src', expectedNull: ''},
-                        {name: 'type', expectedNull: ''}
+                        {name: 'text', expectedNull: 'null'},
+                        {name: 'htmlFor', expectedNull: 'null'},
+                        {name: 'event', expectedNull: 'null'},
+                        {name: 'charset', expectedNull: 'null'},
+                        {name: 'src', expectedNull: 'null', isUrl: true},
+                        {name: 'type', expectedNull: 'null'},
+                        {name: 'crossOrigin', expectedNull: 'null'},
+                        {name: 'nonce', expectedNull: 'null'}
                     ]
                 },
                 {