Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderBlockFlow.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003-2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ skipping 167 matching lines @@
     LayoutUnit applyAfterBreak(RenderBox* child, LayoutUnit logicalOffset, MarginInfo&); // If the child has an after break, then return a new offset that shifts to the top of the next page/column.
 
     LayoutUnit adjustBlockChildForPagination(LayoutUnit logicalTopAfterClear, LayoutUnit estimateWithoutPagination, RenderBox* child, bool atBeforeSideOfBlock);
 
 protected:
     OwnPtr<RenderBlockFlowRareData> m_rareData;
 
     friend class MarginInfo;
 };
 
-inline RenderBlockFlow& toRenderBlockFlow(RenderObject& object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(object.isRenderBlockFlow());
-    return static_cast<RenderBlockFlow&>(object);
-}
-
-inline const RenderBlockFlow& toRenderBlockFlow(const RenderObject& object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(object.isRenderBlockFlow());
-    return static_cast<const RenderBlockFlow&>(object);
-}
-
-inline RenderBlockFlow* toRenderBlockFlow(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderBlockFlow());
-    return static_cast<RenderBlockFlow*>(object);
-}
-
-inline const RenderBlockFlow* toRenderBlockFlow(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderBlockFlow());
-    return static_cast<const RenderBlockFlow*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderBlockFlow(const RenderBlockFlow*);
-void toRenderBlockFlow(const RenderBlockFlow&);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlockFlow, isRenderBlockFlow());
 
 } // namespace WebCore
 
 #endif // RenderBlockFlow_h