Have to invalidate the mute button when changing the volume

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 207 matching lines @@
 
 void MediaControls::changedMute()
 {
     m_panelMuteButton->changedMute();
 }
 
 void MediaControls::changedVolume()
 {
     if (m_volumeSlider)
         m_volumeSlider->setVolume(m_mediaController->volume());
+    if (m_panelMuteButton && m_panelMuteButton->renderer())
+        m_panelMuteButton->renderer()->repaint();
 }
 
 void MediaControls::changedClosedCaptionsVisibility()
 {
     if (m_toggleClosedCaptionsButton)
         m_toggleClosedCaptionsButton->updateDisplayType();
 }
 
 void MediaControls::refreshClosedCaptionsButtonVisibility()
 {
@@ skipping 139 matching lines @@
 
 void MediaControls::updateTextTrackDisplay()
 {
     if (!m_textDisplayContainer)
         createTextTrackDisplay();
 
     m_textDisplayContainer->updateDisplay();
 }
 
 }