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

Source/modules/accessibility/AXList.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 AXList final : public AXLayoutObject {
 
 private:
     AXList(LayoutObject*, AXObjectCacheImpl&);
 
 public:
     static PassRefPtrWillBeRawPtr<AXList> create(LayoutObject*, AXObjectCacheImpl&);
-    virtual ~AXList();
+    ~AXList() override;
 
-    virtual bool isList() const override { return true; }
+    bool isList() const override { return true; }
 
-    virtual AccessibilityRole roleValue() const override final;
+    AccessibilityRole roleValue() const final;
 private:
     bool isDescriptionList() const;
-    virtual bool computeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override;
+    bool computeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override;
 };
 
 } // namespace blink
 
 #endif // AXList_h