Move widow-avoiding code from RenderBlock down to RenderBlockFlow.

Source/core/rendering/RenderBlock.h

Index: Source/core/rendering/RenderBlock.h
diff --git a/Source/core/rendering/RenderBlock.h b/Source/core/rendering/RenderBlock.h
index 6f41d8d610e8072860a5e9d772c3f6f665a71fa9..0acc3ca5dd6a6c977deae7ad2ba6e603cfea26d3 100644
--- a/Source/core/rendering/RenderBlock.h
+++ b/Source/core/rendering/RenderBlock.h
@@ -213,14 +213,6 @@ public:
     unsigned columnCount(ColumnInfo*) const;
     LayoutRect columnRectAt(ColumnInfo*, unsigned) const;
 
-    bool shouldBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_lineBreakToAvoidWidow >= 0; }
-    void clearShouldBreakAtLineToAvoidWidow() const;
-    int lineBreakToAvoidWidow() const { return m_rareData ? m_rareData->m_lineBreakToAvoidWidow : -1; }
-    void setBreakAtLineToAvoidWidow(int);
-    void clearDidBreakAtLineToAvoidWidow();
-    void setDidBreakAtLineToAvoidWidow();
-    bool didBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_didBreakAtLineToAvoidWidow; }
-
     // The page logical offset is the object's offset from the top of the page in the page progression
     // direction (so an x-offset in vertical text and a y-offset for horizontal text).
     LayoutUnit pageLogicalOffset() const { return m_rareData ? m_rareData->m_pageLogicalOffset : LayoutUnit(); }
@@ -507,15 +499,10 @@ public:
     public:
         RenderBlockRareData()
             : m_pageLogicalOffset(0)
-            , m_lineBreakToAvoidWidow(-1)
-            , m_didBreakAtLineToAvoidWidow(false)
         {
         }
 
         LayoutUnit m_pageLogicalOffset;
-
-        int m_lineBreakToAvoidWidow : 31;
-        unsigned m_didBreakAtLineToAvoidWidow : 1;
      };
 
 protected: