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

third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 284 matching lines @@
   HTMLInputElement* input = hostInput();
   if (!input || !input->layoutObject())
     return sliderThumbShadowPartId();
 
   const ComputedStyle& sliderStyle = input->layoutObject()->styleRef();
   switch (sliderStyle.appearance()) {
     case MediaSliderPart:
     case MediaSliderThumbPart:
     case MediaVolumeSliderPart:
     case MediaVolumeSliderThumbPart:
-    case MediaFullscreenVolumeSliderPart:
-    case MediaFullscreenVolumeSliderThumbPart:
       return mediaSliderThumbShadowPartId();
     default:
       return sliderThumbShadowPartId();
   }
 }
 
 // --------------------------------
 
 inline SliderContainerElement::SliderContainerElement(Document& document)
     : HTMLDivElement(document),
@@ skipping 110 matching lines @@
   if (!ownerShadowHost() || !ownerShadowHost()->layoutObject())
     return sliderContainer;
 
   const ComputedStyle& sliderStyle =
       ownerShadowHost()->layoutObject()->styleRef();
   switch (sliderStyle.appearance()) {
     case MediaSliderPart:
     case MediaSliderThumbPart:
     case MediaVolumeSliderPart:
     case MediaVolumeSliderThumbPart:
-    case MediaFullscreenVolumeSliderPart:
-    case MediaFullscreenVolumeSliderThumbPart:
       return mediaSliderContainer;
     default:
       return sliderContainer;
   }
 }
 
 void SliderContainerElement::updateTouchEventHandlerRegistry() {
   if (m_hasTouchEventHandler) {
     return;
   }
@@ skipping 10 matching lines @@
   updateTouchEventHandlerRegistry();
   HTMLElement::didMoveToNewDocument(oldDocument);
 }
 
 void SliderContainerElement::removeAllEventListeners() {
   Node::removeAllEventListeners();
   m_hasTouchEventHandler = false;
 }
 
 }  // namespace blink