Changed ComputedStyle's EVisibility to be an enum class and fixed naming

third_party/WebKit/Source/core/layout/LayoutTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 562 matching lines @@
 
         adjustedLayoutBoundsWithScrollbars.setWidth(layoutView->viewWidth(IncludeScrollbars));
         adjustedLayoutBoundsWithScrollbars.setHeight(layoutView->viewHeight(IncludeScrollbars));
     }
 
     if (markedLayer)
         ts << (markedLayer == &layer ? "*" : " ");
 
     writeIndent(ts, indent);
 
-    if (layer.layoutObject()->style()->visibility() == HIDDEN)
+    if (layer.layoutObject()->style()->visibility() == EVisibility::Hidden)
         ts << "hidden ";
 
     ts << "layer ";
 
     if (behavior & LayoutAsTextShowAddresses)
         ts << static_cast<const void*>(&layer) << " ";
 
     ts << adjustedLayoutBoundsWithScrollbars;
 
     if (!adjustedLayoutBounds.isEmpty()) {
@@ skipping 251 matching lines @@
     element->document().updateStyleAndLayout();
 
     LayoutObject* layoutObject = element->layoutObject();
     if (!layoutObject || !layoutObject->isListItem())
         return String();
 
     return toLayoutListItem(layoutObject)->markerText();
 }
 
 } // namespace blink