Simplify insertion of text track container

Source/core/html/shadow/MediaControls.cpp

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 523 matching lines @@
 
 void MediaControls::createTextTrackDisplay()
 {
     if (m_textDisplayContainer)
         return;
 
     RefPtrWillBeRawPtr<MediaControlTextTrackContainerElement> textDisplayContainer = MediaControlTextTrackContainerElement::create(*this);
     m_textDisplayContainer = textDisplayContainer.get();
 
     // Insert it before (behind) all other control elements.
-    if (m_overlayPlayButton)
-        m_overlayEnclosure->insertBefore(textDisplayContainer.release(), m_overlayPlayButton);
-    else
-        m_overlayEnclosure->insertBefore(textDisplayContainer.release(), m_overlayCastButton);
+    m_overlayEnclosure->insertBefore(textDisplayContainer.release(), m_overlayEnclosure->firstChild());
 }
 
 void MediaControls::showTextTrackDisplay()
 {
     if (!m_textDisplayContainer)
         createTextTrackDisplay();
     m_textDisplayContainer->show();
 }
 
 void MediaControls::hideTextTrackDisplay()
@@ skipping 26 matching lines @@
     visitor->trace(m_toggleClosedCaptionsButton);
     visitor->trace(m_fullScreenButton);
     visitor->trace(m_durationDisplay);
     visitor->trace(m_enclosure);
     visitor->trace(m_castButton);
     visitor->trace(m_overlayCastButton);
     HTMLDivElement::trace(visitor);
 }
 
 }