Make Element::elementData() / ensureUniqueElementData() protected

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 bd2e0b29ceb3484252b9994aa58c2184728a1bb3..15b7bfa44dc3bb91c8fe11bba1a5a8dab9448e01 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -298,8 +298,7 @@ public:
     // Remove attributes that might introduce scripting from the vector leaving the element unchanged.
     void stripScriptingAttributes(Vector<Attribute>&) const;
 
-    const ElementData* elementData() const { return m_elementData.get(); }
-    UniqueElementData& ensureUniqueElementData();
+    bool sharesSameElementData(const Element& other) const { return elementData() == other.elementData(); }
 
     void synchronizeAllAttributes() const;
 
@@ -513,6 +512,9 @@ public:
 protected:
     Element(const QualifiedName& tagName, Document*, ConstructionType);
 
+    const ElementData* elementData() const { return m_elementData.get(); }
+    UniqueElementData& ensureUniqueElementData();
+
     void addPropertyToPresentationAttributeStyle(MutableStylePropertySet*, CSSPropertyID, CSSValueID identifier);
     void addPropertyToPresentationAttributeStyle(MutableStylePropertySet*, CSSPropertyID, double value, CSSPrimitiveValue::UnitType);
     void addPropertyToPresentationAttributeStyle(MutableStylePropertySet*, CSSPropertyID, const String& value);