Fix virtual/override/final usage in Source/modules/.

Source/modules/accessibility/AXSVGRoot.h

Index: Source/modules/accessibility/AXSVGRoot.h
diff --git a/Source/modules/accessibility/AXSVGRoot.h b/Source/modules/accessibility/AXSVGRoot.h
index a286b4906954f3c829ddeed94866d3aecf37e16c..21fc11cc44b694a22c61a3d7f68fffdded0baa1e 100644
--- a/Source/modules/accessibility/AXSVGRoot.h
+++ b/Source/modules/accessibility/AXSVGRoot.h
@@ -42,13 +42,13 @@ protected:
 
 public:
     static PassRefPtrWillBeRawPtr<AXSVGRoot> create(LayoutObject*, AXObjectCacheImpl&);
-    virtual ~AXSVGRoot();
+    ~AXSVGRoot() override;
 
     void setParent(AXObject*) override;
 
 private:
-    virtual AXObject* computeParent() const override;
-    virtual bool isAXSVGRoot() const override { return true; }
+    AXObject* computeParent() const override;
+    bool isAXSVGRoot() const override { return true; }
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXSVGRoot, isAXSVGRoot());