Fix virtual/override/final usage in Source/core/html/.

Source/core/html/MediaController.h

 /*
  * Copyright (C) 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 26 matching lines @@
 class Clock;
 class ExceptionState;
 class ExecutionContext;
 class GenericEventQueue;
 
 class MediaController final : public EventTargetWithInlineData, public RefCountedWillBeNoBase<MediaController> {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_EVENT_TARGET(MediaController);
 public:
     static PassRefPtrWillBeRawPtr<MediaController> create(ExecutionContext*);
-    virtual ~MediaController();
+    ~MediaController() override;
 
     void addMediaElement(HTMLMediaElement*);
     void removeMediaElement(HTMLMediaElement*);
 
     PassRefPtrWillBeRawPtr<TimeRanges> buffered() const;
     PassRefPtrWillBeRawPtr<TimeRanges> seekable() const;
     PassRefPtrWillBeRawPtr<TimeRanges> played();
 
     double duration() const;
     double currentTime() const;
@@ skipping 39 matching lines @@
     void updateMediaElements();
     void bringElementUpToSpeed(HTMLMediaElement*);
     void scheduleEvent(const AtomicString& eventName);
     void clearPositionTimerFired(Timer<MediaController>*);
     bool hasEnded() const;
     void scheduleTimeupdateEvent();
     void timeupdateTimerFired(Timer<MediaController>*);
     void startTimeupdateTimer();
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const override;
-    virtual ExecutionContext* executionContext() const override { return m_executionContext; }
+    const AtomicString& interfaceName() const override;
+    ExecutionContext* executionContext() const override { return m_executionContext; }
 
     friend class HTMLMediaElement;
     friend class MediaControllerEventListener;
     // FIXME: A MediaController should ideally keep an otherwise
     // unreferenced slaved media element alive. When Oilpan is
     // enabled by default, consider making the hash set references
     // strong to accomplish that. crbug.com/383072
     typedef WillBeHeapLinkedHashSet<RawPtrWillBeWeakMember<HTMLMediaElement>> MediaElementSequence;
     MediaElementSequence m_mediaElements;
     bool m_paused;
     double m_defaultPlaybackRate;
     double m_volume;
     mutable double m_position;
     bool m_muted;
     ReadyState m_readyState;
     PlaybackState m_playbackState;
     OwnPtrWillBeMember<GenericEventQueue> m_pendingEventsQueue;
     mutable Timer<MediaController> m_clearPositionTimer;
     OwnPtr<Clock> m_clock;
     RawPtrWillBeWeakMember<ExecutionContext> m_executionContext;
     Timer<MediaController> m_timeupdateTimer;
     double m_previousTimeupdateTime;
 };
 
 } // namespace blink
 
 #endif // MediaController_h