Remove TreatNullAs=NullString for miscellaneous HTML elements

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 a1bb97b9198d41b9800c157eec82c08147c82556..c2ff257bbf66d422cf23d74c45d44a5785d0ecde 100644
--- a/LayoutTests/fast/dom/element-attribute-js-null.html
+++ b/LayoutTests/fast/dom/element-attribute-js-null.html
@@ -171,7 +171,7 @@
                     type: 'HTMLBlockquoteElement',
                     elementToUse: document.createElement('blockquote'),
                     attributes: [
-                        {name: 'cite', expectedNull: ''}
+                        {name: 'cite', expectedNull: 'null', isUrl: true}
                     ]
                 },
                 {
@@ -211,7 +211,7 @@
                     type: 'HTMLDivElement',
                     elementToUse: document.createElement('div'),
                     attributes: [
-                        {name: 'align', expectedNull: ''}
+                        {name: 'align', expectedNull: 'null'}
                     ]
                 },
 
@@ -373,7 +373,7 @@
                     type: 'HTMLLIElement',
                     elementToUse: document.createElement('li'),
                     attributes: [
-                        {name: 'type', expectedNull: ''}
+                        {name: 'type', expectedNull: 'null'}
                     ]
                 },
                 {
@@ -442,7 +442,7 @@
                     type: 'HTMLOListElement',
                     elementToUse: document.createElement('ol'),
                     attributes: [
-                        {name: 'type', expectedNull: ''}
+                        {name: 'type', expectedNull: 'null'}
                     ]
                 },
                 {
@@ -465,7 +465,7 @@
                     type: 'HTMLParagraphElement',
                     elementToUse: document.createElement('p'),
                     attributes: [
-                        {name: 'align', expectedNull: ''}
+                        {name: 'align', expectedNull: 'null'}
                     ]
                 },
                 {
@@ -486,7 +486,7 @@
                     type: 'HTMLQuoteElement',
                     elementToUse: document.createElement('q'),
                     attributes: [
-                        {name: 'cite', expectedNull: ''}
+                        {name: 'cite', expectedNull: 'null', isUrl:true}
                     ]
                 },
                 {
@@ -628,7 +628,7 @@
                     type: 'HTMLUListElement',
                     elementToUse: document.createElement('ul'),
                     attributes: [
-                        {name: 'type', expectedNull: ''}
+                        {name: 'type', expectedNull: 'null'}
                     ]
                 },
                 {