Remove the -webkit-fullscreen-volume-* pseudos, they're dead code.

third_party/WebKit/Source/core/layout/LayoutTheme.cpp

 /**
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 219 matching lines @@
 
   // Call the appropriate style adjustment method based off the appearance
   // value.
   switch (style.appearance()) {
     case MenulistPart:
       return adjustMenuListStyle(style, e);
     case MenulistButtonPart:
       return adjustMenuListButtonStyle(style, e);
     case SliderHorizontalPart:
     case SliderVerticalPart:
-    case MediaFullscreenVolumeSliderPart:
     case MediaSliderPart:
     case MediaVolumeSliderPart:
       return adjustSliderContainerStyle(style, e);
     case SliderThumbHorizontalPart:
     case SliderThumbVerticalPart:
       return adjustSliderThumbStyle(style);
     case SearchFieldPart:
       return adjustSearchFieldStyle(style);
     case SearchFieldCancelButtonPart:
       return adjustSearchFieldCancelButtonStyle(style);
@@ skipping 661 matching lines @@
   // padding - not honored by WinIE, needs to be removed.
   style.resetPadding();
 
   // border - honored by WinIE, but looks terrible (just paints in the control
   // box and turns off the Windows XP theme)
   // for now, we will not honor it.
   style.resetBorder();
 }
 
 }  // namespace blink