Revert Enable new multicol for testing and experimental web platform features.

Source/core/paint/DeprecatedPaintLayer.h

Index: Source/core/paint/DeprecatedPaintLayer.h
diff --git a/Source/core/paint/DeprecatedPaintLayer.h b/Source/core/paint/DeprecatedPaintLayer.h
index edbcd58fe86ace6c207a78bdb4a028d340372e27..992d1d3beffdc5f0cdc81926090f77569df99396 100644
--- a/Source/core/paint/DeprecatedPaintLayer.h
+++ b/Source/core/paint/DeprecatedPaintLayer.h
@@ -611,6 +611,9 @@ private:
     void updatePagination();
     void clearPaginationRecursive();
 
+    // FIXME: Temporary. Remove when new columns come online.
+    bool useRegionBasedColumns() const;
+
     DeprecatedPaintLayerType m_layerType;
 
     // Self-painting layer is an optimization where we avoid the heavy Layer painting