Remove BackgroundBleedBackgroundOverBorder

Source/core/layout/LayoutBoxModelObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 35 matching lines @@
 // Modes for some of the line-related functions.
 enum LinePositionMode { PositionOnContainingLine, PositionOfInteriorLineBoxes };
 enum LineDirectionMode { HorizontalLine, VerticalLine };
 typedef unsigned BorderEdgeFlags;
 
 enum BackgroundBleedAvoidance {
     BackgroundBleedNone,
     BackgroundBleedShrinkBackground,
     BackgroundBleedClipOnly,
     BackgroundBleedClipLayer,
-    BackgroundBleedBackgroundOverBorder,
 };
 
 enum ContentChangeType {
     ImageChanged,
     CanvasChanged,
     CanvasContextChanged
 };
 
 class InlineFlowBox;
 
@@ skipping 199 matching lines @@
     virtual bool isBoxModelObject() const override final { return true; }
 
     OwnPtr<DeprecatedPaintLayer> m_layer;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBoxModelObject, isBoxModelObject());
 
 } // namespace blink
 
 #endif // LayoutBoxModelObject_h