Remove CSSCharsetRule

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

Index: LayoutTests/fast/dom/css-element-attribute-js-null.html
diff --git a/LayoutTests/fast/dom/css-element-attribute-js-null.html b/LayoutTests/fast/dom/css-element-attribute-js-null.html
index d5e0c64c77c09f7f60b7d90914bb38d7e19a5087..8b2209fe83a1576a42b2282cefcd3f553e512d3e 100644
--- a/LayoutTests/fast/dom/css-element-attribute-js-null.html
+++ b/LayoutTests/fast/dom/css-element-attribute-js-null.html
@@ -12,9 +12,6 @@
         @keyframes name { }
         @page { }
     </style>
-    <!-- @charset must be the first rule per spec, and additionally
-         with no leading whitespace per our parser. -->
-    <style>@charset "UTF-8";</style>
     <script>
         function printOut(msg) {
             var console = document.getElementById("console");
@@ -58,7 +55,6 @@
             var mediaRule = rules[1];
             var keyframesRule = rules[2];
             var pageRule = rules[3];
-            var charsetRule = document.styleSheets[2].cssRules[0];
             var style = rule.style;
             var mediaList = mediaRule.media;
 
@@ -72,13 +68,6 @@
                     ]
                 },
                 {
-                    type: 'CSSCharsetRule',
-                    elementToUse: charsetRule,
-                    attributes: [
-                        {name: 'encoding', expectedNull: 'null'}
-                    ]
-                },
-                {
                     type: 'CSSKeyframesRule',
                     elementToUse: keyframesRule,
                     attributes: [