Remove CURSOR_VISIBILITY, it's always off

Source/core/page/UseCounter.h

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 94 matching lines @@
         PrecisionAttribute,
         PrefixedDirectoryAttribute,
         PrefixedSpeechAttribute,
         RequiredAttribute,
         ResultsAttribute,
         StepAttribute,
         PageVisits,
         HTMLMarqueeElement,
         CSSOverflowMarquee,
         Reflection,
-        CursorVisibility,
+        CursorVisibility, // Removed, was -webkit-cursor-visibility.
         StorageInfo,
         XFrameOptions,
         XFrameOptionsSameOrigin,
         XFrameOptionsSameOriginWithBadAncestorChain,
         DeprecatedFlexboxWebContent,
         DeprecatedFlexboxChrome,
         DeprecatedFlexboxChromeExtension,
         SVGTRefElement,
         UnprefixedPerformanceTimeline,
         PrefixedPerformanceTimeline,
@@ skipping 42 matching lines @@
     }
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h