Remove unused show/hideTextTrackDisplay()

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 896ff6f8b0c86e89dae76c9cf378e1279c8052e6..a1609d46b610e60b2bf1d9cd7b97fd6f44b4a335 100644
--- a/Source/core/html/shadow/MediaControls.cpp
+++ b/Source/core/html/shadow/MediaControls.cpp
@@ -528,20 +528,6 @@ void MediaControls::createTextTrackDisplay()
     m_overlayEnclosure->insertBefore(textDisplayContainer.release(), m_overlayEnclosure->firstChild());
 }
 
-void MediaControls::showTextTrackDisplay()
-{
-    if (!m_textDisplayContainer)
-        createTextTrackDisplay();
-    m_textDisplayContainer->show();
-}
-
-void MediaControls::hideTextTrackDisplay()
-{
-    if (!m_textDisplayContainer)
-        createTextTrackDisplay();
-    m_textDisplayContainer->hide();
-}
-
 void MediaControls::updateTextTrackDisplay()
 {
     if (!m_textDisplayContainer)