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

Source/modules/accessibility/AXListBox.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 24 matching lines @@
 
 class AXObjectCacheImpl;
 
 class AXListBox final : public AXLayoutObject {
 
 private:
     AXListBox(LayoutObject*, AXObjectCacheImpl&);
 
 public:
     static PassRefPtrWillBeRawPtr<AXListBox> create(LayoutObject*, AXObjectCacheImpl&);
-    virtual ~AXListBox();
+    ~AXListBox() override;
 
-    virtual AccessibilityRole determineAccessibilityRole() override final;
-    virtual bool isAXListBox() const override { return true; }
-    virtual bool shouldFocusActiveDescendant() const override { return true; }
-    virtual AXObject* activeDescendant() const override;
+    AccessibilityRole determineAccessibilityRole() final;
+    bool isAXListBox() const override { return true; }
+    bool shouldFocusActiveDescendant() const override { return true; }
+    AXObject* activeDescendant() const override;
 
     void activeIndexChanged();
 
 private:
     int m_activeIndex;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXListBox, isAXListBox());
 
 } // namespace blink
 
 #endif // AXListBox_h