Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderBlock.h

Index: Source/core/rendering/RenderBlock.h
diff --git a/Source/core/rendering/RenderBlock.h b/Source/core/rendering/RenderBlock.h
index 643e3cdc9dc66f050e8019a348c984e23f1fe1f5..5899b43b90c6a869846befe2eee06cb2a2127435 100644
--- a/Source/core/rendering/RenderBlock.h
+++ b/Source/core/rendering/RenderBlock.h
@@ -879,20 +879,7 @@ private:
     static bool s_canPropagateFloatIntoSibling;
 };
 
-inline RenderBlock* toRenderBlock(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderBlock());
-    return static_cast<RenderBlock*>(object);
-}
-
-inline const RenderBlock* toRenderBlock(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderBlock());
-    return static_cast<const RenderBlock*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderBlock(const RenderBlock*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
 
 } // namespace WebCore