Remove media controls when not in use.

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 121 matching lines @@
 };
 
 // ----------------------------
 
 class MediaControlOverlayPlayButtonElement FINAL : public MediaControlInputElement {
 public:
     static PassRefPtr<MediaControlOverlayPlayButtonElement> create(Document&);
 
     virtual void updateDisplayType() OVERRIDE;
 
+    void setVisible(bool);
+
 private:
     explicit MediaControlOverlayPlayButtonElement(Document&);
 
     virtual const AtomicString& shadowPseudoId() const OVERRIDE;
     virtual void defaultEventHandler(Event*) OVERRIDE;
+
+    bool m_visible;
 };
 
 // ----------------------------
 
 class MediaControlToggleClosedCaptionsButtonElement FINAL : public MediaControlInputElement {
 public:
     static PassRefPtr<MediaControlToggleClosedCaptionsButtonElement> create(Document&, MediaControls*);
 
     virtual bool willRespondToMouseClickEvents() OVERRIDE { return true; }
 
@@ skipping 93 matching lines @@
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
 
     IntRect m_videoDisplaySize;
     float m_fontSize;
 };
 
 
 } // namespace WebCore
 
 #endif // MediaControlElements_h