Implement cloneNode for Document

LayoutTests/fast/dom/HTMLDocument/clone-node-expected.txt

Index: LayoutTests/fast/dom/HTMLDocument/clone-node-expected.txt
diff --git a/LayoutTests/fast/dom/HTMLDocument/clone-node-expected.txt b/LayoutTests/fast/dom/HTMLDocument/clone-node-expected.txt
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+++ b/LayoutTests/fast/dom/HTMLDocument/clone-node-expected.txt
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+Tests cloneNode for HTMLDocument.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS document.cloneNode(false).__proto__ is HTMLDocument.prototype
+PASS className(document.cloneNode(false)) is "HTMLDocument"
+PASS document.cloneNode(true).title is document.title
+PASS document.cloneNode(true).compatMode is "BackCompat"
+PASS doc.cloneNode(false).__proto__ is HTMLDocument.prototype
+PASS className(doc.cloneNode(false)) is "HTMLDocument"
+PASS doc.cloneNode(true).title is doc.title
+PASS doc.cloneNode(true).compatMode is "CSS1Compat"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+