Delete RenderBlockFlow.

sky/engine/core/rendering/RenderFlexibleBox.h

Index: sky/engine/core/rendering/RenderFlexibleBox.h
diff --git a/sky/engine/core/rendering/RenderFlexibleBox.h b/sky/engine/core/rendering/RenderFlexibleBox.h
index 634adcc5d36893b6d341ca9ef8ba17f54643a047..ef1055fc07787a9465fbb6af6238ba72f0f29526 100644
--- a/sky/engine/core/rendering/RenderFlexibleBox.h
+++ b/sky/engine/core/rendering/RenderFlexibleBox.h
@@ -38,7 +38,7 @@ namespace blink {
 
 class RenderFlexibleBox : public RenderBlock {
 public:
-    RenderFlexibleBox(Element*);
+    RenderFlexibleBox(ContainerNode*);
     virtual ~RenderFlexibleBox();
 
     static RenderFlexibleBox* createAnonymous(Document*);
@@ -46,7 +46,7 @@ public:
     virtual const char* renderName() const override;
 
     virtual bool isFlexibleBox() const override final { return true; }
-    void layout() final;
+    void layout();
 
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
     virtual int firstLineBoxBaseline() const override;