Remove Attr child nodes (making Attr a Node, not a ContainerNode)

LayoutTests/http/tests/security/xss-DENIED-iframe-src-alias.html

Index: LayoutTests/http/tests/security/xss-DENIED-iframe-src-alias.html
diff --git a/LayoutTests/http/tests/security/xss-DENIED-iframe-src-alias.html b/LayoutTests/http/tests/security/xss-DENIED-iframe-src-alias.html
index 71f0f7b768a6af1017485f13c6d4a6881cec9f8d..b07221bb3c7734931f4beb5e426bb7e32304dba4 100644
--- a/LayoutTests/http/tests/security/xss-DENIED-iframe-src-alias.html
+++ b/LayoutTests/http/tests/security/xss-DENIED-iframe-src-alias.html
@@ -32,34 +32,6 @@ window.onload = function()
             a.nodeValue = alertMsg("setAttributeNodeNS");
             iFrame.setAttributeNodeNS(a);
         },
-        // Child manipulation methods
-        function(iFrame) { 
-            var src = iFrame.attributes['src'];
-            src.appendChild(document.createTextNode(alertMsg("appendChild() + removeChild()")));
-            src.removeChild(src.firstChild);
-        },
-        function(iFrame) { 
-            var src = iFrame.attributes['src'];
-            src.replaceChild(document.createTextNode(alertMsg("replaceChild()")), src.firstChild);
-        },
-        function(iFrame) { 
-            var src = iFrame.attributes['src'];
-            while (src.firstChild)
-                src.removeChild(src.firstChild);
-            src.appendChild(document.createTextNode(alertMsg("removeChild() + appendChild()")));
-        },
-        function(iFrame) { 
-            var src = iFrame.attributes['src'];
-            while (src.firstChild)
-                src.removeChild(src.firstChild);
-            var msg = alertMsg("removeChild() + appendChild() + appendChild()");
-            src.appendChild(document.createTextNode(msg.slice(0,4)));
-            src.appendChild(document.createTextNode(msg.slice(4)));
-        },
-        function(iFrame) { 
-            var src = iFrame.attributes['src'];
-            src.insertBefore(document.createTextNode(alertMsg("insertBefore()")), src.firstChild);
-        },
         // NamedNodeMap
         function(iFrame) {
             var a = document.createAttribute('src');