Remove MediaControls::showVolumeSlider()

Source/core/html/shadow/MediaControlElements.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 92 matching lines @@
 class MediaControlPanelMuteButtonElement FINAL : public MediaControlMuteButtonElement {
 public:
     static PassRefPtr<MediaControlPanelMuteButtonElement> create(Document&, MediaControls*);
 
     virtual bool willRespondToMouseMoveEvents() OVERRIDE { return true; }
 
 private:
     explicit MediaControlPanelMuteButtonElement(Document&, MediaControls*);
 
     virtual const AtomicString& shadowPseudoId() const OVERRIDE;
-    virtual void defaultEventHandler(Event*) OVERRIDE;
-
-    MediaControls* m_controls;
 };
 
 // ----------------------------
 
 class MediaControlPlayButtonElement FINAL : public MediaControlInputElement {
 public:
     static PassRefPtr<MediaControlPlayButtonElement> create(Document&);
 
     virtual bool willRespondToMouseClickEvents() OVERRIDE { return true; }
     virtual void updateDisplayType() OVERRIDE;
@@ skipping 124 matching lines @@
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
 
     IntRect m_videoDisplaySize;
     float m_fontSize;
 };
 
 
 } // namespace WebCore
 
 #endif // MediaControlElements_h