Remove MediaControls::showVolumeSlider()

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 271 matching lines @@
     if (now > 0) {
         m_currentTimeDisplay->show();
         m_durationDisplay->hide();
     }
 
     // Allow the theme to format the time.
     m_currentTimeDisplay->setInnerText(RenderTheme::theme().formatMediaControlsCurrentTime(now, duration), IGNORE_EXCEPTION);
     m_currentTimeDisplay->setCurrentValue(now);
 }
 
-void MediaControls::showVolumeSlider()
-{
-    if (!m_mediaController->hasAudio())
-        return;
-
-    m_volumeSlider->show();
-}
-
 void MediaControls::changedMute()
 {
     m_panelMuteButton->changedMute();
 
     if (m_mediaController->muted())
         m_volumeSlider->setVolume(0);
     else
         m_volumeSlider->setVolume(m_mediaController->volume());
 }
 
@@ skipping 154 matching lines @@
     m_textDisplayContainer->updateDisplay();
 }
 
 void MediaControls::insertTextTrackContainer(PassRefPtr<MediaControlTextTrackContainerElement> textTrackContainer)
 {
     // Insert it before the first controller element so it always displays behind the controls.
     insertBefore(textTrackContainer, m_enclosure);
 }
 
 }