Remove unused UseCounter features

Source/core/frame/UseCounter.cpp

 
 /*
  * Copyright (C) 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 661 matching lines @@
 
     case PrefixedVideoExitFullscreen:
         return "'HTMLVideoElement.webkitExitFullscreen()' is deprecated. Please use 'Document.exitFullscreen()' and 'Document.webkitExitFullscreen()' instead.";
 
     case PrefixedVideoEnterFullScreen:
         return "'HTMLVideoElement.webkitEnterFullScreen()' is deprecated. Please use 'Element.requestFullscreen()' and 'Element.webkitRequestFullscreen()' instead.";
 
     case PrefixedVideoExitFullScreen:
         return "'HTMLVideoElement.webkitExitFullScreen()' is deprecated. Please use 'Document.exitFullscreen()' and 'Document.webkitExitFullscreen()' instead.";
 
-    case PrefixedMediaSourceOpen:
-        return "'WebKitMediaSource' is deprecated. Please use 'MediaSource' instead.";
-
     case MediaErrorEncrypted:
         return "'MediaError.MEDIA_ERR_ENCRYPTED' is deprecated. This error code is never used.";
 
     case PrefixedSpeechAttribute:
         return "The 'x-webkit-speech' input field attribute is deprecated. Please use the JavaScript API instead.";
 
     case PrefixedGamepad:
         return "'navigator.webkitGetGamepads' is deprecated. Please use 'navigator.getGamepads' instead.";
 
     case PrefixedRequestAnimationFrame:
@@ skipping 67 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        http://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace WebCore