Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderTableCol.h

Index: Source/core/rendering/RenderTableCol.h
diff --git a/Source/core/rendering/RenderTableCol.h b/Source/core/rendering/RenderTableCol.h
index dd3e1b0d80a03c42e7c23fbb10988fa08bde0a5c..a28f36085bbe3f00e95cd9bc8d32915578e2962c 100644
--- a/Source/core/rendering/RenderTableCol.h
+++ b/Source/core/rendering/RenderTableCol.h
@@ -103,20 +103,7 @@ private:
     unsigned m_span;
 };
 
-inline RenderTableCol* toRenderTableCol(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderTableCol());
-    return static_cast<RenderTableCol*>(object);
-}
-
-inline const RenderTableCol* toRenderTableCol(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderTableCol());
-    return static_cast<const RenderTableCol*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderTableCol(const RenderTableCol*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCol, isRenderTableCol());
 
 }