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

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index d6c298a73982a99d637007027bab4d7da285f2b1..a25d232b032e3fc6ab1687a9c5e25b3f926f1cae 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1644,12 +1644,6 @@ void RenderObject::computeRectForRepaint(const RenderLayerModelObject* repaintCo
         return;
 
     if (RenderObject* o = parent()) {
-        if (o->isRenderBlockFlow()) {
-            RenderBlock* cb = toRenderBlock(o);
-            if (cb->hasColumns())
-                cb->adjustRectForColumns(rect);
-        }
-
         if (o->hasOverflowClip()) {
             RenderBox* boxParent = toRenderBox(o);
             boxParent->applyCachedClipAndScrollOffsetForRepaint(rect);
@@ -2223,15 +2217,10 @@ void RenderObject::mapLocalToContainer(const RenderLayerModelObject* repaintCont
     LayoutPoint centerPoint = roundedLayoutPoint(transformState.mappedPoint());
     if (mode & ApplyContainerFlip && o->isBox()) {
         if (o->style()->isFlippedBlocksWritingMode())
-            transformState.move(toRenderBox(o)->flipForWritingModeIncludingColumns(roundedLayoutPoint(transformState.mappedPoint())) - centerPoint);
+            transformState.move(LayoutPoint() - centerPoint);
         mode &= ~ApplyContainerFlip;
     }
 
-    LayoutSize columnOffset;
-    o->adjustForColumns(columnOffset, roundedLayoutPoint(transformState.mappedPoint()));
-    if (!columnOffset.isZero())
-        transformState.move(columnOffset);
-
     if (o->hasOverflowClip())
         transformState.move(-toRenderBox(o)->scrolledContentOffset());
 
@@ -2251,7 +2240,7 @@ const RenderObject* RenderObject::pushMappingToContainer(const RenderLayerModelO
     if (container->hasOverflowClip())
         offset = -toRenderBox(container)->scrolledContentOffset();
 
-    geometryMap.push(this, offset, hasColumns());
+    geometryMap.push(this, offset);
 
     return container;
 }
@@ -2321,13 +2310,11 @@ LayoutSize RenderObject::offsetFromContainer(RenderObject* o, const LayoutPoint&
 
     LayoutSize offset;
 
-    o->adjustForColumns(offset, point);
-
     if (o->hasOverflowClip())
         offset -= toRenderBox(o)->scrolledContentOffset();
 
     if (offsetDependsOnPoint)
-        *offsetDependsOnPoint = hasColumns() || o->isRenderFlowThread();
+        *offsetDependsOnPoint = o->isRenderFlowThread();
 
     return offset;
 }
@@ -2708,7 +2695,7 @@ void RenderObject::destroyAndCleanupAnonymousWrappers()
             break;
         // Render flow threads are tracked by the FlowThreadController, so we can't destroy them here.
         // Column spans are tracked elsewhere.
-        if (destroyRootParent->isRenderFlowThread() || destroyRootParent->isAnonymousColumnSpanBlock())
+        if (destroyRootParent->isRenderFlowThread())
             break;
 
         if (destroyRootParent->firstChild() != this || destroyRootParent->lastChild() != this)