Remove writing mode code from the linebox tree.

sky/engine/core/rendering/RenderBoxModelObject.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 14 matching lines @@
 #define RenderBoxModelObject_h
 
 #include "core/rendering/RenderLayerModelObject.h"
 #include "core/rendering/style/ShadowData.h"
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 // Modes for some of the line-related functions.
 enum LinePositionMode { PositionOnContainingLine, PositionOfInteriorLineBoxes };
-enum LineDirectionMode { HorizontalLine, VerticalLine };
+// FIXME(sky): Remove this enum
+enum LineDirectionMode { HorizontalLine };
 typedef unsigned BorderEdgeFlags;
 
 enum BackgroundBleedAvoidance {
     BackgroundBleedNone,
     BackgroundBleedShrinkBackground,
     BackgroundBleedClipBackground,
     BackgroundBleedBackgroundOverBorder
 };
 
 enum ContentChangeType {
@@ skipping 273 matching lines @@
     void drawBoxSideFromPath(GraphicsContext*, const LayoutRect&, const Path&, const class BorderEdge[],
                             float thickness, float drawThickness, BoxSide, const RenderStyle*,
                             Color, EBorderStyle, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBoxModelObject, isBoxModelObject());
 
 } // namespace blink
 
 #endif // RenderBoxModelObject_h