Update remaining HTML classes to use OVERRIDE / FINAL when needed

Source/core/html/track/TextTrackList.h

Index: Source/core/html/track/TextTrackList.h
diff --git a/Source/core/html/track/TextTrackList.h b/Source/core/html/track/TextTrackList.h
index 7c150b2c931935a69628810a8bbec9c031a7c833..0d4c8838c5ee2af2ee01e4bb55f001c51995237b 100644
--- a/Source/core/html/track/TextTrackList.h
+++ b/Source/core/html/track/TextTrackList.h
@@ -41,14 +41,14 @@ class HTMLMediaElement;
 class TextTrack;
 class TextTrackList;
 
-class TextTrackList : public RefCounted<TextTrackList>, public ScriptWrappable, public EventTargetWithInlineData {
+class TextTrackList FINAL : public RefCounted<TextTrackList>, public ScriptWrappable, public EventTargetWithInlineData {
     REFCOUNTED_EVENT_TARGET(TextTrackList);
 public:
     static PassRefPtr<TextTrackList> create(HTMLMediaElement* owner)
     {
         return adoptRef(new TextTrackList(owner));
     }
-    ~TextTrackList();
+    virtual ~TextTrackList();
 
     unsigned length() const;
     int getTrackIndex(TextTrack*);