Remove the old multicol implementation.

Source/core/layout/LayoutBoxModelObject.cpp

Index: Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/Source/core/layout/LayoutBoxModelObject.cpp b/Source/core/layout/LayoutBoxModelObject.cpp
index b82d053b67fbd5e03673e2ab8e59a7425c382031..d8e951fe882385f73251d08d494a6af590e98b7e 100644
--- a/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/Source/core/layout/LayoutBoxModelObject.cpp
@@ -852,11 +852,6 @@ void LayoutBoxModelObject::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, Tra
         // to return flowthread coordinates in the first place? We're effectively performing two
         // conversions here, when in fact none is needed.
         containerOffset = toLayoutSize(flowThread->visualPointToFlowThreadPoint(toLayoutPoint(containerOffset)));
-    } else if (!style()->hasOutOfFlowPosition() && o->hasColumns()) {
-        LayoutBlock* block = toLayoutBlock(o);
-        LayoutPoint point(roundedLayoutPoint(transformState.mappedPoint()));
-        point -= containerOffset;
-        block->adjustForColumnRect(containerOffset, point);
     }
 
     bool preserve3D = mode & UseTransforms && (o->style()->preserves3D() || style()->preserves3D());