Remove multicol special-cases from invalidation and the pre-paint tree walk

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 2f529857d1578833956c90f49f3161ebce026cac..d73574cebda9bf51122448558dc54b08c3ad4810 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -2067,11 +2067,8 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
 
   static bool isAllowedToModifyLayoutTreeStructure(Document&);
 
-  // Returns the parent for paint invalidation.
-  // - For LayoutView, returns the owner layout object in the containing frame
-  //   if any or nullptr;
-  // - For multi-column spanner, returns the spanner placeholder;
-  // - Otherwise returns parent().
+  // Returns the parent for paint invalidation. For LayoutView, returns the
+  // owner layout object in the containing frame if any, or nullptr.
   inline LayoutObject* paintInvalidationParent() const;
   LayoutObject* slowPaintInvalidationParentForTesting() const;