Fix virtual/override/final usage in Source/core/dom/.

Source/core/dom/CDATASection.h

Index: Source/core/dom/CDATASection.h
diff --git a/Source/core/dom/CDATASection.h b/Source/core/dom/CDATASection.h
index 3532e989fab95ed8e19b507e9567fe7c3f3f4f2c..c461800ba36f4f7d1646b9dba3502cd81b800562 100644
--- a/Source/core/dom/CDATASection.h
+++ b/Source/core/dom/CDATASection.h
@@ -35,9 +35,9 @@ public:
 private:
     CDATASection(Document&, const String&);
 
-    virtual String nodeName() const override;
-    virtual NodeType nodeType() const override;
-    virtual PassRefPtrWillBeRawPtr<Text> cloneWithData(const String&) override;
+    String nodeName() const override;
+    NodeType nodeType() const override;
+    PassRefPtrWillBeRawPtr<Text> cloneWithData(const String&) override;
 };
 
 DEFINE_NODE_TYPE_CASTS(CDATASection, nodeType() == Node::CDATA_SECTION_NODE);