Remove unused MediaControls* in MediaControlToggleClosedCaptionsButtonElement

Source/core/html/shadow/MediaControlElements.cpp

Index: Source/core/html/shadow/MediaControlElements.cpp
diff --git a/Source/core/html/shadow/MediaControlElements.cpp b/Source/core/html/shadow/MediaControlElements.cpp
index 1e15664e8708f5908cdee194d13bb927561c7f43..3ee968f5bb55ec580ac98df51cd5b1575dfa3c4c 100644
--- a/Source/core/html/shadow/MediaControlElements.cpp
+++ b/Source/core/html/shadow/MediaControlElements.cpp
@@ -399,16 +399,14 @@ const AtomicString& MediaControlOverlayPlayButtonElement::shadowPseudoId() const
 
 // ----------------------------
 
-MediaControlToggleClosedCaptionsButtonElement::MediaControlToggleClosedCaptionsButtonElement(Document& document, MediaControls*)
+MediaControlToggleClosedCaptionsButtonElement::MediaControlToggleClosedCaptionsButtonElement(Document& document)
     : MediaControlInputElement(document, MediaShowClosedCaptionsButton)
 {
 }
 
-PassRefPtr<MediaControlToggleClosedCaptionsButtonElement> MediaControlToggleClosedCaptionsButtonElement::create(Document& document, MediaControls* controls)
+PassRefPtr<MediaControlToggleClosedCaptionsButtonElement> MediaControlToggleClosedCaptionsButtonElement::create(Document& document)
 {
-    ASSERT(controls);
-
-    RefPtr<MediaControlToggleClosedCaptionsButtonElement> button = adoptRef(new MediaControlToggleClosedCaptionsButtonElement(document, controls));
+    RefPtr<MediaControlToggleClosedCaptionsButtonElement> button = adoptRef(new MediaControlToggleClosedCaptionsButtonElement(document));
     button->ensureUserAgentShadowRoot();
     button->setType("button");
     button->hide();