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

Source/core/dom/ScriptLoader.h

Index: Source/core/dom/ScriptLoader.h
diff --git a/Source/core/dom/ScriptLoader.h b/Source/core/dom/ScriptLoader.h
index 9836c34f34d8f3697e605c8c9690889226f867a8..8505253716d5e551584752e02e86cf453245231a 100644
--- a/Source/core/dom/ScriptLoader.h
+++ b/Source/core/dom/ScriptLoader.h
@@ -44,7 +44,7 @@ public:
         return adoptPtrWillBeNoop(new ScriptLoader(element, createdByParser, isEvaluated));
     }
 
-    virtual ~ScriptLoader();
+    ~ScriptLoader() override;
     DECLARE_VIRTUAL_TRACE();
 
     Element* element() const { return m_element; }
@@ -97,7 +97,7 @@ private:
     ScriptLoaderClient* client() const;
 
     // ResourceClient
-    virtual void notifyFinished(Resource*) override;
+    void notifyFinished(Resource*) override;
 
     RawPtrWillBeMember<Element> m_element;
     ResourcePtr<ScriptResource> m_resource;