Remove CURSOR_VISIBILITY, it's always off

Source/core/css/CSSParser.cpp

Index: Source/core/css/CSSParser.cpp
diff --git a/Source/core/css/CSSParser.cpp b/Source/core/css/CSSParser.cpp
index e0cc5c99cd656c97a5dff2bcc822f8d39272a6d4..005fb87c4799fb53912d48bfd797e1edfd1f5fdc 100644
--- a/Source/core/css/CSSParser.cpp
+++ b/Source/core/css/CSSParser.cpp
@@ -2003,13 +2003,6 @@ bool CSSParser::parseValue(CSSPropertyID propId, bool important)
         break;
     }
 
-#if ENABLE(CURSOR_VISIBILITY)
-    case CSSPropertyWebkitCursorVisibility:
-        if (id == CSSValueAuto || id == CSSValueAutoHide)
-            validPrimitive = true;
-        break;
-#endif
-
     case CSSPropertyBackgroundAttachment:
 #if ENABLE(CSS_COMPOSITING)
     case CSSPropertyBackgroundBlendMode: