Remove Node.prefix so it's no longer visible to script.

LayoutTests/fast/dom/Node/script-tests/initial-values.js

Index: LayoutTests/fast/dom/Node/script-tests/initial-values.js
diff --git a/LayoutTests/fast/dom/Node/script-tests/initial-values.js b/LayoutTests/fast/dom/Node/script-tests/initial-values.js
index 4c404b57b966c3af2cdd2bc0861f6e720de5234b..9d235b99c9de3842b1472537418892707df32585 100644
--- a/LayoutTests/fast/dom/Node/script-tests/initial-values.js
+++ b/LayoutTests/fast/dom/Node/script-tests/initial-values.js
@@ -50,7 +50,6 @@ var comment = document.createComment("foo");
 shouldBe("comment.nodeName", "'#comment'");
 shouldBe("comment.localName", "null");
 shouldBe("comment.namespaceURI", "null");
-shouldBe("comment.prefix", "null");
 shouldBe("comment.nodeValue", "'foo'");
 shouldBe("comment.data", "'foo'");
 
@@ -59,7 +58,6 @@ var cdata = xmlDoc.createCDATASection("foo");
 shouldBe("cdata.nodeName", "'#cdata-section'");
 shouldBe("cdata.localName", "null");
 shouldBe("cdata.namespaceURI", "null");
-shouldBe("cdata.prefix", "null");
 shouldBe("cdata.nodeValue", "'foo'");
 shouldBe("cdata.data", "'foo'");
 
@@ -67,7 +65,6 @@ var fragment = document.createDocumentFragment();
 shouldBe("fragment.nodeName", "'#document-fragment'");
 shouldBe("fragment.localName", "null");
 shouldBe("fragment.namespaceURI", "null");
-shouldBe("fragment.prefix", "null");
 shouldBe("fragment.nodeValue", "null");
 
 var doc = document.implementation.createDocument("http://www.w3.org/1999/xhtml", "html", null);
@@ -76,7 +73,6 @@ shouldBe("doc.localName", "null");
 // Spec: http://www.w3.org/TR/DOM-Level-2-Core/core.html#Level-2-Core-DOM-createDocument
 // Currently both FF and WebKit return null here, disagreeing with the spec
 shouldBe("doc.namespaceURI", "'http://www.w3.org/1999/xhtml'");
-shouldBe("doc.prefix", "null");
 shouldBe("doc.nodeValue", "null");
 
 var doctype = document.implementation.createDocumentType("svg", "-//W3C//DTD SVG 1.1//EN", "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd");
@@ -84,7 +80,6 @@ shouldBe("doctype.nodeName", "'svg'");
 shouldBe("doctype.name", "'svg'");
 shouldBe("doctype.localName", "null");
 shouldBe("doctype.namespaceURI", "null");
-shouldBe("doctype.prefix", "null");
 shouldBe("doctype.nodeValue", "null");
 
 debug("Element creation using createElement on an HTML doc:")
@@ -161,7 +156,6 @@ var processingInstruction = document.createProcessingInstruction('xml-stylesheet
 shouldBe("processingInstruction.nodeName", "'xml-stylesheet'");
 shouldBe("processingInstruction.localName", "null");
 shouldBe("processingInstruction.namespaceURI", "null");
-shouldBe("processingInstruction.prefix", "null");
 // DOM Core Level 2 and DOM Core Level 3 disagree on ProcessingInstruction.nodeValue
 // L2: entire content excluding the target
 // L3: same as ProcessingInstruction.data
@@ -175,7 +169,6 @@ processingInstruction = xmlDoc.createProcessingInstruction('xml-stylesheet', 'ty
 shouldBe("processingInstruction.nodeName", "'xml-stylesheet'");
 shouldBe("processingInstruction.localName", "null");
 shouldBe("processingInstruction.namespaceURI", "null");
-shouldBe("processingInstruction.prefix", "null");
 shouldBe("processingInstruction.nodeValue", "'type=\"text/xsl\" href=\"missing.xsl\"'");
 shouldBe("processingInstruction.target", "'xml-stylesheet'");
 shouldBe("processingInstruction.data", "'type=\"text/xsl\" href=\"missing.xsl\"'");
@@ -185,6 +178,5 @@ var text = document.createTextNode("foo");
 shouldBe("text.nodeName", "'#text'");
 shouldBe("text.localName", "null");
 shouldBe("text.namespaceURI", "null");
-shouldBe("text.prefix", "null");
 shouldBe("text.nodeValue", "'foo'");
 shouldBe("text.data", "'foo'");