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

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 4445 matching lines @@
     // If the writing modes of the child and parent match, then we don't have to
     // do anything fancy. Just return the result.
     LayoutRect rect = visualOverflowRect();
     if (parentStyle.writingMode() == style()->writingMode())
         return rect;
 
     // We are putting ourselves into our parent's coordinate space.  If there is a flipped block mismatch
     // in a particular axis, then we have to flip the rect along that axis.
     if (style()->writingMode() == RightToLeftWritingMode || parentStyle.writingMode() == RightToLeftWritingMode)
         rect.setX(size().width() - rect.maxX());
-    else if (style()->writingMode() == BottomToTopWritingMode || parentStyle.writingMode() == BottomToTopWritingMode)
-        rect.setY(size().height() - rect.maxY());
 
     return rect;
 }
 
 LayoutRect LayoutBox::logicalLayoutOverflowRectForPropagation(const ComputedStyle& parentStyle) const
 {
     LayoutRect rect = layoutOverflowRectForPropagation(parentStyle);
     if (!parentStyle.isHorizontalWritingMode())
         return rect.transposedRect();
     return rect;
@@ skipping 30 matching lines @@
 
     // If the writing modes of the child and parent match, then we don't have to
     // do anything fancy. Just return the result.
     if (parentStyle.writingMode() == style()->writingMode())
         return rect;
 
     // We are putting ourselves into our parent's coordinate space.  If there is a flipped block mismatch
     // in a particular axis, then we have to flip the rect along that axis.
     if (style()->writingMode() == RightToLeftWritingMode || parentStyle.writingMode() == RightToLeftWritingMode)
         rect.setX(size().width() - rect.maxX());
-    else if (style()->writingMode() == BottomToTopWritingMode || parentStyle.writingMode() == BottomToTopWritingMode)
-        rect.setY(size().height() - rect.maxY());
 
     return rect;
 }
 
 LayoutRect LayoutBox::noOverflowRect() const
 {
     // Because of the special coordinate system used for overflow rectangles and many other
     // rectangles (not quite logical, not quite physical), we need to flip the block progression
     // coordinate in vertical-rl and horizontal-bt writing modes. In other words, the rectangle
     // returned is physical, except for the block direction progression coordinate (y in horizontal
@@ skipping 310 matching lines @@
     StyleImage* borderImage = style()->borderImage().image();
     return borderImage && borderImage->canRender(*this, style()->effectiveZoom()) && borderImage->isLoaded();
 }
 
 ShapeOutsideInfo* LayoutBox::shapeOutsideInfo() const
 {
     return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : nullptr;
 }
 
 } // namespace blink