Remove TreatNullAs=NullString for HTMLTable*Element

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 b2571369ffb44360fa4425813a54f7028645dcfc..7cdda47716148a7fdca2bbbde6426620a7a79de3 100644
--- a/LayoutTests/fast/dom/element-attribute-js-null.html
+++ b/LayoutTests/fast/dom/element-attribute-js-null.html
@@ -593,71 +593,71 @@
                     type: 'HTMLTableCaptionElement',
                     elementToUse: document.createElement('caption'),
                     attributes: [
-                        {name: 'align', expectedNull: ''}
+                        {name: 'align', expectedNull: 'null'}
                     ]
                 },
                 {
                     type: 'HTMLTableCellElement',
                     elementToUse: document.createElement('td'),
                     attributes: [
-                        {name: 'abbr', expectedNull: ''},
-                        {name: 'align', expectedNull: ''},
-                        {name: 'axis', expectedNull: ''},
+                        {name: 'abbr', expectedNull: 'null'},
+                        {name: 'align', expectedNull: 'null'},
+                        {name: 'axis', expectedNull: 'null'},
                         {name: 'bgColor', expectedNull: ''},
-                        {name: 'ch', expectedNull: ''},
-                        {name: 'chOff', expectedNull: ''},
+                        {name: 'ch', expectedNull: 'null'},
+                        {name: 'chOff', expectedNull: 'null'},
                         {name: 'headers', expectedNull: ''},
-                        {name: 'height', expectedNull: ''},
-                        {name: 'scope', expectedNull: ''},
-                        {name: 'vAlign', expectedNull: ''},
-                        {name: 'width', expectedNull: ''}
+                        {name: 'height', expectedNull: 'null'},
+                        {name: 'scope', expectedNull: 'null'},
+                        {name: 'vAlign', expectedNull: 'null'},
+                        {name: 'width', expectedNull: 'null'}
                     ]
                 },
                 {
                     type: 'HTMLTableColElement',
                     elementToUse: document.createElement('col'),
                     attributes: [
-                        {name: 'align', expectedNull: ''},
-                        {name: 'ch', expectedNull: ''},
-                        {name: 'chOff', expectedNull: ''},
-                        {name: 'vAlign', expectedNull: ''},
-                        {name: 'width', expectedNull: ''}
+                        {name: 'align', expectedNull: 'null'},
+                        {name: 'ch', expectedNull: 'null'},
+                        {name: 'chOff', expectedNull: 'null'},
+                        {name: 'vAlign', expectedNull: 'null'},
+                        {name: 'width', expectedNull: 'null'}
                     ]
                 },
                 {
                     type: 'HTMLTableElement',
                     elementToUse: document.createElement('table'),
                     attributes: [
-                        {name: 'align', expectedNull: ''},
+                        {name: 'align', expectedNull: 'null'},
                         {name: 'bgColor', expectedNull: ''},
-                        {name: 'border', expectedNull: ''},
+                        {name: 'border', expectedNull: 'null'},
                         {name: 'cellPadding', expectedNull: ''},
                         {name: 'cellSpacing', expectedNull: ''},
-                        {name: 'frame', expectedNull: ''},
-                        {name: 'rules', expectedNull: ''},
-                        {name: 'summary', expectedNull: ''},
-                        {name: 'width', expectedNull: ''}
+                        {name: 'frame', expectedNull: 'null'},
+                        {name: 'rules', expectedNull: 'null'},
+                        {name: 'summary', expectedNull: 'null'},
+                        {name: 'width', expectedNull: 'null'}
                     ]
                 },
                 {
                     type: 'HTMLTableRowElement',
                     elementToUse: document.createElement('tr'),
                     attributes: [
-                        {name: 'align', expectedNull: ''},
+                        {name: 'align', expectedNull: 'null'},
                         {name: 'bgColor', expectedNull: ''},
-                        {name: 'ch', expectedNull: ''},
-                        {name: 'chOff', expectedNull: ''},
-                        {name: 'vAlign', expectedNull: ''}
+                        {name: 'ch', expectedNull: 'null'},
+                        {name: 'chOff', expectedNull: 'null'},
+                        {name: 'vAlign', expectedNull: 'null'}
                     ]
                 },
                 {
                     type: 'HTMLTableSectionElement',
                     elementToUse: document.createElement('tbody'),
                     attributes: [
-                        {name: 'align', expectedNull: ''},
-                        {name: 'ch', expectedNull: ''},
-                        {name: 'chOff', expectedNull: ''},
-                        {name: 'vAlign', expectedNull: ''}
+                        {name: 'align', expectedNull: 'null'},
+                        {name: 'ch', expectedNull: 'null'},
+                        {name: 'chOff', expectedNull: 'null'},
+                        {name: 'vAlign', expectedNull: 'null'}
                     ]
                 },
                 {