Treat zero-width collapsed borders as invisible

third_party/WebKit/Source/core/style/ComputedStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
@@ skipping 88 matching lines @@
   kBorderStyleInset,
   kBorderStyleGroove,
   kBorderStyleOutset,
   kBorderStyleRidge,
   kBorderStyleDotted,
   kBorderStyleDashed,
   kBorderStyleSolid,
   kBorderStyleDouble
 };
 
-enum EBorderPrecedence {
-  kBorderPrecedenceOff,
-  kBorderPrecedenceTable,
-  kBorderPrecedenceColumnGroup,
-  kBorderPrecedenceColumn,
-  kBorderPrecedenceRowGroup,
-  kBorderPrecedenceRow,
-  kBorderPrecedenceCell
-};
-
 enum OutlineIsAuto { kOutlineIsAutoOff = 0, kOutlineIsAutoOn };
 
 enum EMarginCollapse {
   kMarginCollapseCollapse,
   kMarginCollapseSeparate,
   kMarginCollapseDiscard
 };
 
 // Box decoration attributes. Not inherited.
 
@@ skipping 376 matching lines @@
   kScrollSnapTypeNone,
   kScrollSnapTypeMandatory,
   kScrollSnapTypeProximity
 };
 
 enum AutoRepeatType { kNoAutoRepeat, kAutoFill, kAutoFit };
 
 }  // namespace blink
 
 #endif  // ComputedStyleConstants_h