Oilpan: Move more code of RenderObject destructors to destroy().

Source/core/rendering/RenderBoxModelObject.h

Index: Source/core/rendering/RenderBoxModelObject.h
diff --git a/Source/core/rendering/RenderBoxModelObject.h b/Source/core/rendering/RenderBoxModelObject.h
index a918aa74ad9826f31c9741a6113d20f073128a54..468958e089c89b7af68f5d32d33028f914032c0c 100644
--- a/Source/core/rendering/RenderBoxModelObject.h
+++ b/Source/core/rendering/RenderBoxModelObject.h
@@ -57,6 +57,7 @@ class RenderBoxModelObject : public RenderLayerModelObject {
 public:
     RenderBoxModelObject(ContainerNode*);
     virtual ~RenderBoxModelObject();
+    virtual void destroy() OVERRIDE;
 
     LayoutSize relativePositionOffset() const;
     LayoutSize relativePositionLogicalOffset() const { return style()->isHorizontalWritingMode() ? relativePositionOffset() : relativePositionOffset().transposedSize(); }