Move rendering/RenderBox to layout/LayoutBox.

Source/core/rendering/RenderDeprecatedFlexibleBox.h

Index: Source/core/rendering/RenderDeprecatedFlexibleBox.h
diff --git a/Source/core/rendering/RenderDeprecatedFlexibleBox.h b/Source/core/rendering/RenderDeprecatedFlexibleBox.h
index 5b364964d18b81c1697cdd12fe62225fb68b0e0a..8ebcf8a661d7266b4f9f25590710d8372ec0783c 100644
--- a/Source/core/rendering/RenderDeprecatedFlexibleBox.h
+++ b/Source/core/rendering/RenderDeprecatedFlexibleBox.h
@@ -46,12 +46,12 @@ public:
     bool isStretchingChildren() const { return m_stretchingChildren; }
     virtual bool canCollapseAnonymousBlockChild() const override { return false; }
 
-    void placeChild(RenderBox* child, const LayoutPoint& location);
+    void placeChild(LayoutBox* child, const LayoutPoint& location);
 
 private:
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
 
-    LayoutUnit allowedChildFlex(RenderBox* child, bool expanding, unsigned group);
+    LayoutUnit allowedChildFlex(LayoutBox* child, bool expanding, unsigned group);
 
     bool hasMultipleLines() const { return style()->boxLines() == MULTIPLE; }
     bool isVertical() const { return style()->boxOrient() == VERTICAL; }