Have DOMPatchSupport and DocumentFragment deal with Document references

Source/core/dom/DocumentFragment.cpp

Index: Source/core/dom/DocumentFragment.cpp
diff --git a/Source/core/dom/DocumentFragment.cpp b/Source/core/dom/DocumentFragment.cpp
index 3bbb750237007f8c822a807bc81d55fb0b907e39..141d571fe3f943fd86ff74a1ad0815be3c403994 100644
--- a/Source/core/dom/DocumentFragment.cpp
+++ b/Source/core/dom/DocumentFragment.cpp
@@ -35,10 +35,9 @@ DocumentFragment::DocumentFragment(Document* document, ConstructionType construc
     ScriptWrappable::init(this);
 }
 
-PassRefPtr<DocumentFragment> DocumentFragment::create(Document* document)
+PassRefPtr<DocumentFragment> DocumentFragment::create(Document& document)
 {
-    ASSERT(document);
-    return adoptRef(new DocumentFragment(document, Node::CreateDocumentFragment));
+    return adoptRef(new DocumentFragment(&document, Node::CreateDocumentFragment));
 }
 
 String DocumentFragment::nodeName() const
@@ -67,7 +66,7 @@ bool DocumentFragment::childTypeAllowed(NodeType type) const
 
 PassRefPtr<Node> DocumentFragment::cloneNode(bool deep)
 {
-    RefPtr<DocumentFragment> clone = create(&document());
+    RefPtr<DocumentFragment> clone = create(document());
     if (deep)
         cloneChildNodes(clone.get());
     return clone.release();