Remove the "horizontal-bt" value from -webkit-writing-mode

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.h

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 65 matching lines @@
         FlipForRowReverse,
         NoFlipForRowReverse,
     };
 
     enum ChildLayoutType {
         LayoutIfNeeded,
         ForceLayout,
         NeverLayout
     };
 
+    enum class TransformedWritingMode {
+        TopToBottomWritingMode, RightToLeftWritingMode, LeftToRightWritingMode, BottomToTopWritingMode
+    };
+
     typedef HashMap<const LayoutBox*, LayoutUnit> InflexibleFlexItemSize;
     typedef Vector<LayoutBox*> OrderedFlexItemList;
 
     struct LineContext;
     struct Violation;
 
     // Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
     typedef Vector<LayoutRect, 8> ChildFrameRects;
 
     bool hasOrthogonalFlow(const LayoutBox& child) const;
     bool isColumnFlow() const;
     bool isLeftToRightFlow() const;
     bool isMultiline() const;
     Length flexBasisForChild(const LayoutBox& child) const;
     LayoutUnit crossAxisExtentForChild(const LayoutBox& child) const;
     LayoutUnit crossAxisIntrinsicExtentForChild(const LayoutBox& child) const;
     LayoutUnit childIntrinsicHeight(const LayoutBox& child) const;
     LayoutUnit childIntrinsicWidth(const LayoutBox& child) const;
     LayoutUnit mainAxisExtentForChild(const LayoutBox& child) const;
     LayoutUnit crossAxisExtent() const;
     LayoutUnit mainAxisExtent() const;
     LayoutUnit crossAxisContentExtent() const;
     LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight);
     LayoutUnit computeMainAxisExtentForChild(const LayoutBox& child, SizeType, const Length& size);
-    WritingMode transformedWritingMode() const;
+    TransformedWritingMode transformedWritingMode() const;
     LayoutUnit flowAwareBorderStart() const;
     LayoutUnit flowAwareBorderEnd() const;
     LayoutUnit flowAwareBorderBefore() const;
     LayoutUnit flowAwareBorderAfter() const;
     LayoutUnit flowAwarePaddingStart() const;
     LayoutUnit flowAwarePaddingEnd() const;
     LayoutUnit flowAwarePaddingBefore() const;
     LayoutUnit flowAwarePaddingAfter() const;
     LayoutUnit flowAwareMarginStartForChild(const LayoutBox& child) const;
     LayoutUnit flowAwareMarginEndForChild(const LayoutBox& child) const;
@@ skipping 55 matching lines @@
 
     mutable OrderIterator m_orderIterator;
     int m_numberOfInFlowChildrenOnFirstLine;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFlexibleBox, isFlexibleBox());
 
 } // namespace blink
 
 #endif // LayoutFlexibleBox_h