Have ContainerNodeAlgorithms deal with references instead of pointers

Source/core/svg/SVGElementInstance.cpp

Index: Source/core/svg/SVGElementInstance.cpp
diff --git a/Source/core/svg/SVGElementInstance.cpp b/Source/core/svg/SVGElementInstance.cpp
index 7bf604809b4bfd47990b7865215bef6642224afa..3e835c184e4a1412bd0fd244deb80363db40809e 100644
--- a/Source/core/svg/SVGElementInstance.cpp
+++ b/Source/core/svg/SVGElementInstance.cpp
@@ -149,7 +149,7 @@ void SVGElementInstance::detach()
     m_directUseElement = 0;
     m_correspondingUseElement = 0;
 
-    removeDetachedChildrenInContainer<SVGElementInstance, SVGElementInstance>(this);
+    removeDetachedChildrenInContainer<SVGElementInstance, SVGElementInstance>(*this);
 }
 
 PassRefPtr<SVGElementInstanceList> SVGElementInstance::childNodes()
@@ -165,7 +165,7 @@ void SVGElementInstance::setShadowTreeElement(SVGElement* element)
 
 void SVGElementInstance::appendChild(PassRefPtr<SVGElementInstance> child)
 {
-    appendChildToContainer<SVGElementInstance, SVGElementInstance>(child.get(), this);
+    appendChildToContainer<SVGElementInstance, SVGElementInstance>(*child, *this);
 }
 
 void SVGElementInstance::invalidateAllInstancesOfElement(SVGElement* element)