Make Element::synchronizeAllAttributes() private

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..717de19074bf0c8547b073f2e78fdcb4f0d52caf 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -301,8 +301,6 @@ public:
     const ElementData* elementData() const { return m_elementData.get(); }
     UniqueElementData& ensureUniqueElementData();
 
-    void synchronizeAllAttributes() const;
-
     // Clones attributes only.
     void cloneAttributesFromElement(const Element&);
 
@@ -590,6 +588,7 @@ private:
     void didModifyAttribute(const QualifiedName&, const AtomicString&);
     void didRemoveAttribute(const QualifiedName&);
 
+    void synchronizeAllAttributes() const;
     void synchronizeAttribute(const QualifiedName&) const;
 
     void updateId(const AtomicString& oldId, const AtomicString& newId);