Remove support for anonymous deprecated flexboxes.

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 f6576ab2c95146926e182695737baa6cbb48a76a..be2aacb3b3181c0e12aebaf0712d0f2d4bec6319 100644
--- a/Source/core/rendering/RenderDeprecatedFlexibleBox.h
+++ b/Source/core/rendering/RenderDeprecatedFlexibleBox.h
@@ -31,11 +31,9 @@ class FlexBoxIterator;
 
 class RenderDeprecatedFlexibleBox FINAL : public RenderBlock {
 public:
-    RenderDeprecatedFlexibleBox(Element*);
+    RenderDeprecatedFlexibleBox(Element&);
     virtual ~RenderDeprecatedFlexibleBox();
 
-    static RenderDeprecatedFlexibleBox* createAnonymous(Document*);
-
     virtual const char* renderName() const OVERRIDE;
 
     virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE;
@@ -51,7 +49,7 @@ public:
 
     void placeChild(RenderBox* child, const LayoutPoint& location);
 
-protected:
+private:
     virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
     virtual void computePreferredLogicalWidths() OVERRIDE;
 
@@ -61,11 +59,10 @@ protected:
     bool isVertical() const { return style()->boxOrient() == VERTICAL; }
     bool isHorizontal() const { return style()->boxOrient() == HORIZONTAL; }
 
-    bool m_stretchingChildren;
-
-private:
     void applyLineClamp(FlexBoxIterator&, bool relayoutChildren);
     void clearLineClamp();
+
+    bool m_stretchingChildren;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderDeprecatedFlexibleBox, isDeprecatedFlexibleBox());