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

third_party/WebKit/Source/modules/accessibility/AXSlider.cpp

 /*
  * Copyright (C) 2009 Apple 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 49 matching lines @@
 
   const ComputedStyle* style = m_layoutObject->style();
   if (!style)
     return AccessibilityOrientationHorizontal;
 
   ControlPart styleAppearance = style->appearance();
   switch (styleAppearance) {
     case SliderThumbHorizontalPart:
     case SliderHorizontalPart:
     case MediaSliderPart:
-    case MediaFullscreenVolumeSliderPart:
       return AccessibilityOrientationHorizontal;
 
     case SliderThumbVerticalPart:
     case SliderVerticalPart:
     case MediaVolumeSliderPart:
       return AccessibilityOrientationVertical;
 
     default:
       return AccessibilityOrientationHorizontal;
   }
@@ skipping 66 matching lines @@
   DCHECK(thumbElement);
   return thumbElement->layoutObject();
 }
 
 bool AXSliderThumb::computeAccessibilityIsIgnored(
     IgnoredReasons* ignoredReasons) const {
   return accessibilityIsIgnoredByDefault(ignoredReasons);
 }
 
 }  // namespace blink