Remove internal recursion for RenderBlockFlow and RenderMultiColumnBlock layout

Source/core/rendering/RenderBlock.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 506 matching lines @@
     RenderBlock* clone() const;
     RenderBlock* continuationBefore(RenderObject* beforeChild);
     RenderBlockFlow* containingColumnsBlock(bool allowAnonymousColumnBlock = true);
     RenderBlockFlow* columnsBlockForSpanningElement(RenderObject* newChild);
 
     // End helper functions and structs used by layoutBlockChildren.
 
 protected:
     void determineLogicalLeftPositionForChild(RenderBox* child, ApplyLayoutDeltaMode = DoNotApplyLayoutDelta);
 
-    // Pagination routines.
-    bool relayoutToAvoidWidows(LayoutStateMaintainer&);
-
     // Returns the logicalOffset at the top of the next page. If the offset passed in is already at the top of the current page,
     // then nextPageLogicalTop with ExcludePageBoundary will still move to the top of the next page. nextPageLogicalTop with
     // IncludePageBoundary set will not.
     //
     // For a page height of 800px, the first rule will return 800 if the value passed in is 0. The second rule will simply return 0.
     enum PageBoundaryRule { ExcludePageBoundary, IncludePageBoundary };
     LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
     bool hasNextPage(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
 
     virtual ColumnInfo::PaginationUnit paginationUnit() const;
@@ skipping 98 matching lines @@
             return false;
     }
     return true;
 }
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
 
 } // namespace WebCore
 
 #endif // RenderBlock_h