Remove MediaControls::textTracksChanged

Source/core/html/shadow/MediaControls.cpp

Index: Source/core/html/shadow/MediaControls.cpp
diff --git a/Source/core/html/shadow/MediaControls.cpp b/Source/core/html/shadow/MediaControls.cpp
index 57d0d7332aa13034da29eba261dceaa173f23285..b7f28c3e1fb6b8fd767b85717707a7cb6cf9caa1 100644
--- a/Source/core/html/shadow/MediaControls.cpp
+++ b/Source/core/html/shadow/MediaControls.cpp
@@ -356,11 +356,6 @@ void MediaControls::refreshClosedCaptionsButtonVisibility()
         m_toggleClosedCaptionsButton->hide();
 }
 
-void MediaControls::textTracksChanged()
-{
-    refreshClosedCaptionsButtonVisibility();
-}
-
 static Element* elementFromCenter(Element& element)
 {
     RefPtrWillBeRawPtr<ClientRect> clientRect = element.getBoundingClientRect();