Have DOMPatchSupport and DocumentFragment deal with Document references

Source/core/inspector/DOMEditor.cpp

Index: Source/core/inspector/DOMEditor.cpp
diff --git a/Source/core/inspector/DOMEditor.cpp b/Source/core/inspector/DOMEditor.cpp
index dd6412e41ba9fe5625d4b23fcd35b3758eb93697..152d47ff97cd25039df24769d565d8a4990c17de 100644
--- a/Source/core/inspector/DOMEditor.cpp
+++ b/Source/core/inspector/DOMEditor.cpp
@@ -221,7 +221,8 @@ public:
     virtual bool perform(ExceptionState& es)
     {
         m_oldHTML = createMarkup(m_node.get());
-        DOMPatchSupport domPatchSupport(m_domEditor.get(), m_node->ownerDocument());
+        ASSERT(m_node->ownerDocument());
+        DOMPatchSupport domPatchSupport(m_domEditor.get(), *m_node->ownerDocument());
         m_newNode = domPatchSupport.patchNode(m_node.get(), m_html, es);
         return !es.hadException();
     }