Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/svg/RenderSVGResourceContainer.h

Index: Source/core/rendering/svg/RenderSVGResourceContainer.h
diff --git a/Source/core/rendering/svg/RenderSVGResourceContainer.h b/Source/core/rendering/svg/RenderSVGResourceContainer.h
index 3965093b00889038116a7714f7edc08cb920944a..b5d1d135c02e4924589b9af3a079c10f948937ca 100644
--- a/Source/core/rendering/svg/RenderSVGResourceContainer.h
+++ b/Source/core/rendering/svg/RenderSVGResourceContainer.h
@@ -96,20 +96,7 @@ Renderer* getRenderSVGResourceById(Document& document, const AtomicString& id)
     return 0;
 }
 
-inline RenderSVGResourceContainer* toRenderSVGResourceContainer(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGResourceContainer());
-    return static_cast<RenderSVGResourceContainer*>(object);
-}
-
-inline const RenderSVGResourceContainer* toRenderSVGResourceContainer(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGResourceContainer());
-    return static_cast<const RenderSVGResourceContainer*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderSVGResourceContainer(const RenderSVGResourceContainer*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGResourceContainer, isSVGResourceContainer());
 
 }