*** DO NOT LAND *** Measure the size and complexity of the old multicol implementation.

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 6dab61653e325531de3df6e28b81637c559736d9..fa846a9f26b031eb1857024f7b5070febbe360da 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -1993,22 +1993,8 @@ LayoutSize RenderBox::offsetFromContainer(RenderObject* o, const LayoutPoint& po
     if (isInFlowPositioned())
         offset += offsetForInFlowPosition();
 
-    if (!isInline() || isReplaced()) {
-        if (!style()->hasOutOfFlowPosition() && o->hasColumns()) {
-            RenderBlock* block = toRenderBlock(o);
-            LayoutRect columnRect(frameRect());
-            block->adjustStartEdgeForWritingModeIncludingColumns(columnRect);
-            offset += toSize(columnRect.location());
-            LayoutPoint columnPoint = block->flipForWritingModeIncludingColumns(point + offset);
-            offset = toLayoutSize(block->flipForWritingModeIncludingColumns(toLayoutPoint(offset)));
-            o->adjustForColumns(offset, columnPoint);
-            offset = block->flipForWritingMode(offset);
-
-            if (offsetDependsOnPoint)
-                *offsetDependsOnPoint = true;
-        } else
-            offset += topLeftLocationOffset();
-    }
+    if (!isInline() || isReplaced())
+        offset += topLeftLocationOffset();
 
     if (o->hasOverflowClip())
         offset -= toRenderBox(o)->scrolledContentOffset();
@@ -2180,9 +2166,8 @@ void RenderBox::computeRectForRepaint(const RenderLayerModelObject* repaintConta
         topLeft += layer()->offsetForInFlowPosition();
     }
 
-    if (position != AbsolutePosition && position != FixedPosition && o->hasColumns() && o->isRenderBlockFlow()) {
+    if (position != AbsolutePosition && position != FixedPosition && o->isRenderBlockFlow()) {
         LayoutRect repaintRect(topLeft, rect.size());
-        toRenderBlock(o)->adjustRectForColumns(repaintRect);
         topLeft = repaintRect.location();
         rect = repaintRect;
     }
@@ -4467,13 +4452,6 @@ void RenderBox::addLayoutOverflow(const LayoutRect& rect)
                 hasTopOverflow = true;
         }
 
-        if (hasColumns() && style()->columnProgression() == ReverseColumnProgression) {
-            if (isHorizontalWritingMode() ^ !style()->hasInlineColumnAxis())
-                hasLeftOverflow = !hasLeftOverflow;
-            else
-                hasTopOverflow = !hasTopOverflow;
-        }
-
         if (!hasTopOverflow)
             overflowRect.shiftYEdgeTo(max(overflowRect.y(), clientBox.y()));
         else
@@ -4802,13 +4780,6 @@ LayoutPoint RenderBox::flipForWritingMode(const LayoutPoint& position) const
     return isHorizontalWritingMode() ? LayoutPoint(position.x(), height() - position.y()) : LayoutPoint(width() - position.x(), position.y());
 }
 
-LayoutPoint RenderBox::flipForWritingModeIncludingColumns(const LayoutPoint& point) const
-{
-    if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
-        return flipForWritingMode(point);
-    return toRenderBlock(this)->flipForWritingModeIncludingColumns(point);
-}
-
 LayoutSize RenderBox::flipForWritingMode(const LayoutSize& offset) const
 {
     if (!style()->isFlippedBlocksWritingMode())