Make scrubbing a MediaControls-internal concept

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 68 matching lines @@
     virtual void setMuted(bool) OVERRIDE;
 
     typedef HTMLMediaElement::ReadyState ReadyState;
     ReadyState readyState() const { return m_readyState; }
 
     enum PlaybackState { WAITING, PLAYING, ENDED };
     const AtomicString& playbackState() const;
 
     virtual bool hasAudio() const OVERRIDE;
 
-    virtual void beginScrubbing() OVERRIDE;
-    virtual void endScrubbing() OVERRIDE;
-
     virtual bool canPlay() const OVERRIDE;
 
     bool isBlocked() const;
 
     void clearExecutionContext() { m_executionContext = 0; }
 
 private:
     MediaController(ExecutionContext*);
     void reportControllerState();
     void updateReadyState();
@@ skipping 27 matching lines @@
     mutable Timer<MediaController> m_clearPositionTimer;
     OwnPtr<Clock> m_clock;
     ExecutionContext* m_executionContext;
     Timer<MediaController> m_timeupdateTimer;
     double m_previousTimeupdateTime;
 };
 
 } // namespace WebCore
 
 #endif