Have Element::ensureUniqueElementData() return a reference

Source/core/dom/Element.h

Index: Source/core/dom/Element.h
diff --git a/Source/core/dom/Element.h b/Source/core/dom/Element.h
index 6db11f9558b94d9bbed6a02d1b81a55b338f8c0f..9b1b62264a160ba9a937a3a3496e6944ce103e40 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -285,7 +285,7 @@ public:
     void stripScriptingAttributes(Vector<Attribute>&) const;
 
     const ElementData* elementData() const { return m_elementData.get(); }
-    UniqueElementData* ensureUniqueElementData();
+    UniqueElementData& ensureUniqueElementData();
 
     void synchronizeAllAttributes() const;
 
@@ -789,11 +789,11 @@ inline bool Element::hasClass() const
     return elementData() && elementData()->hasClass();
 }
 
-inline UniqueElementData* Element::ensureUniqueElementData()
+inline UniqueElementData& Element::ensureUniqueElementData()
 {
     if (!elementData() || !elementData()->isUnique())
         createUniqueElementData();
-    return static_cast<UniqueElementData*>(m_elementData.get());
+    return static_cast<UniqueElementData&>(*m_elementData);
 }
 
 // Put here to make them inline.