Update HTML classes to use OVERRIDE / FINAL when needed

Source/core/html/HTMLLabelElement.h

Index: Source/core/html/HTMLLabelElement.h
diff --git a/Source/core/html/HTMLLabelElement.h b/Source/core/html/HTMLLabelElement.h
index f5cadd3d98cdde7a478a67476fdd6ab67e0c8a51..01bcfdebfcb17cb70f0b9ed719a4f39957d2e98a 100644
--- a/Source/core/html/HTMLLabelElement.h
+++ b/Source/core/html/HTMLLabelElement.h
@@ -45,14 +45,14 @@ private:
 
     virtual bool rendererIsFocusable() const OVERRIDE;
     virtual bool isInteractiveContent() const OVERRIDE;
-    virtual void accessKeyAction(bool sendMouseEvents);
+    virtual void accessKeyAction(bool sendMouseEvents) OVERRIDE;
 
     // Overridden to update the hover/active state of the corresponding control.
     virtual void setActive(bool = true) OVERRIDE;
     virtual void setHovered(bool = true) OVERRIDE;
 
     // Overridden to either click() or focus() the corresponding control.
-    virtual void defaultEventHandler(Event*);
+    virtual void defaultEventHandler(Event*) OVERRIDE;
 
     virtual void focus(bool restorePreviousSelection, FocusDirection) OVERRIDE;
 };