Rendering API cleanup

Source/core/rendering/RenderMultiColumnSet.h

Index: Source/core/rendering/RenderMultiColumnSet.h
diff --git a/Source/core/rendering/RenderMultiColumnSet.h b/Source/core/rendering/RenderMultiColumnSet.h
index a1deccd2bf19b9f1c442ab376b0e37e9833cc073..4bc34e8555fdbec9badcfd5d967d36eb33e61706 100644
--- a/Source/core/rendering/RenderMultiColumnSet.h
+++ b/Source/core/rendering/RenderMultiColumnSet.h
@@ -113,11 +113,6 @@ public:
     void attachRegion();
     void detachRegion();
 
-    // This method represents the logical height of the entire flow thread portion used by the region or set.
-    // For RenderRegions it matches logicalPaginationHeight(), but for sets it is the height of all the pages
-    // or columns added together.
-    LayoutUnit logicalHeightOfAllFlowThreadContent() const { return logicalHeightInFlowThread(); }
-
     void paintInvalidationForFlowThreadContent(const LayoutRect& paintInvalidationRect) const;
 
     // The top of the nearest page inside the region. For RenderRegions, this is just the logical top of the