Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/ScriptableDocumentParser.h

Index: Source/core/dom/ScriptableDocumentParser.h
diff --git a/Source/core/dom/ScriptableDocumentParser.h b/Source/core/dom/ScriptableDocumentParser.h
index 18a2f93310f99d250374f87dd2b4444ea473e21e..5cb8a50a108e05c0ec1e16add4a6bf8c5251881b 100644
--- a/Source/core/dom/ScriptableDocumentParser.h
+++ b/Source/core/dom/ScriptableDocumentParser.h
@@ -57,7 +57,7 @@ protected:
     explicit ScriptableDocumentParser(Document*, ParserContentPolicy = AllowScriptingContent);
 
 private:
-    virtual ScriptableDocumentParser* asScriptableDocumentParser() { return this; }
+    virtual ScriptableDocumentParser* asScriptableDocumentParser() OVERRIDE FINAL { return this; }
 
     // http://www.whatwg.org/specs/web-apps/current-work/#script-created-parser
     bool m_wasCreatedByScript;