Update HTML forms classes to use OVERRIDE / FINAL when needed

Source/core/html/forms/CheckboxInputType.h

 /*
  * Copyright (C) 2010 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CheckboxInputType_h
 #define CheckboxInputType_h
 
 #include "core/html/forms/BaseCheckableInputType.h"
 
 namespace WebCore {
 
-class CheckboxInputType : public BaseCheckableInputType {
+class CheckboxInputType FINAL : public BaseCheckableInputType {
 public:
     static PassRefPtr<InputType> create(HTMLInputElement&);
 
 private:
     CheckboxInputType(HTMLInputElement& element) : BaseCheckableInputType(element) { }
     virtual const AtomicString& formControlType() const OVERRIDE;
     virtual bool valueMissing(const String&) const OVERRIDE;
     virtual String valueMissingText() const OVERRIDE;
     virtual void handleKeyupEvent(KeyboardEvent*) OVERRIDE;
     virtual PassOwnPtr<ClickHandlingState> willDispatchClick() OVERRIDE;
     virtual void didDispatchClick(Event*, const ClickHandlingState&) OVERRIDE;
     virtual bool isCheckbox() const OVERRIDE;
     virtual bool supportsIndeterminateAppearance() const OVERRIDE;
 };
 
 } // namespace WebCore
 
 #endif // CheckboxInputType_h