Remove the old multicol implementation.

Source/core/layout/LayoutView.cpp

Index: Source/core/layout/LayoutView.cpp
diff --git a/Source/core/layout/LayoutView.cpp b/Source/core/layout/LayoutView.cpp
index 420970ec29130aae75e4a59fb122f13e96c79aa8..8fbd32b56764b1565f5ebb9ff7fd9e4f62baacc3 100644
--- a/Source/core/layout/LayoutView.cpp
+++ b/Source/core/layout/LayoutView.cpp
@@ -28,7 +28,6 @@
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/HTMLIFrameElement.h"
-#include "core/layout/ColumnInfo.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutFlowThread.h"
 #include "core/layout/LayoutGeometryMap.h"
@@ -152,14 +151,6 @@ void LayoutView::updateLogicalWidth()
         setLogicalWidth(viewLogicalWidthForBoxSizing());
 }
 
-LayoutUnit LayoutView::availableLogicalHeight(AvailableLogicalHeightType heightType) const
-{
-    // If we have columns, then the available logical height is reduced to the column height.
-    if (hasColumns())
-        return columnInfo()->columnHeight();
-    return LayoutBlockFlow::availableLogicalHeight(heightType);
-}
-
 bool LayoutView::isChildAllowed(LayoutObject* child, const ComputedStyle&) const
 {
     return child->isBox();
@@ -869,16 +860,7 @@ LayoutObject* LayoutView::backgroundLayoutObject() const
 
 LayoutRect LayoutView::backgroundRect(LayoutBox* backgroundLayoutObject) const
 {
-    if (!hasColumns())
-        return LayoutRect(unscaledDocumentRect());
-
-    ColumnInfo* columnInfo = this->columnInfo();
-    LayoutRect backgroundRect(0, 0, columnInfo->desiredColumnWidth(), columnInfo->columnHeight() * columnInfo->columnCount());
-    if (!isHorizontalWritingMode())
-        backgroundRect = backgroundRect.transposedRect();
-    backgroundLayoutObject->flipForWritingMode(backgroundRect);
-
-    return backgroundRect;
+    return LayoutRect(unscaledDocumentRect());
 }
 
 IntRect LayoutView::documentRect() const