Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderCombineText.h

Index: Source/core/rendering/RenderCombineText.h
diff --git a/Source/core/rendering/RenderCombineText.h b/Source/core/rendering/RenderCombineText.h
index cddaab1d56f930e81a795b71b959a4abadf7c89e..5cce871d62ba3f85f83f330fd3cb54e898c590dc 100644
--- a/Source/core/rendering/RenderCombineText.h
+++ b/Source/core/rendering/RenderCombineText.h
@@ -49,20 +49,7 @@ private:
     bool m_needsFontUpdate : 1;
 };
 
-inline RenderCombineText* toRenderCombineText(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isCombineText());
-    return static_cast<RenderCombineText*>(object);
-}
-
-inline const RenderCombineText* toRenderCombineText(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isCombineText());
-    return static_cast<const RenderCombineText*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderCombineText(const RenderCombineText*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderCombineText, isCombineText());
 
 } // namespace WebCore