Remove unused MediaControls* in MediaControlToggleClosedCaptionsButtonElement

Source/core/html/shadow/MediaControlElements.h

Index: Source/core/html/shadow/MediaControlElements.h
diff --git a/Source/core/html/shadow/MediaControlElements.h b/Source/core/html/shadow/MediaControlElements.h
index 99924497ce4ef77aca9e0264af8b7bcdcca7e2ca..49c6aa2312f86d4c35e3bd11ffd493d502442fd9 100644
--- a/Source/core/html/shadow/MediaControlElements.h
+++ b/Source/core/html/shadow/MediaControlElements.h
@@ -149,14 +149,14 @@ private:
 
 class MediaControlToggleClosedCaptionsButtonElement FINAL : public MediaControlInputElement {
 public:
-    static PassRefPtr<MediaControlToggleClosedCaptionsButtonElement> create(Document&, MediaControls*);
+    static PassRefPtr<MediaControlToggleClosedCaptionsButtonElement> create(Document&);
 
     virtual bool willRespondToMouseClickEvents() OVERRIDE { return true; }
 
     virtual void updateDisplayType() OVERRIDE;
 
 private:
-    explicit MediaControlToggleClosedCaptionsButtonElement(Document&, MediaControls*);
+    explicit MediaControlToggleClosedCaptionsButtonElement(Document&);
 
     virtual const AtomicString& shadowPseudoId() const OVERRIDE;
     virtual void defaultEventHandler(Event*) OVERRIDE;