Fix for bug 405639 (Dynamically created <svg:use> reference loop causes nsGenericElement leak). r/sr/a=sicking.

content/svg/content/src/nsSVGUseElement.cpp

@@ -62,10 +62,22 @@ NS_IMPL_NS_NEW_SVG_ELEMENT(Use)
 //----------------------------------------------------------------------
 // nsISupports methods
 
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsSVGUseElement)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsSVGUseElement)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mOriginal)
+  tmp->DestroyAnonymousContent();
+  tmp->RemoveListener();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsSVGUseElement)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mOriginal)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mClone)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mSourceContent)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
 NS_IMPL_ADDREF_INHERITED(nsSVGUseElement,nsSVGUseElementBase)
 NS_IMPL_RELEASE_INHERITED(nsSVGUseElement,nsSVGUseElementBase)
 
-NS_INTERFACE_MAP_BEGIN(nsSVGUseElement)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsSVGUseElement)
   NS_INTERFACE_MAP_ENTRY(nsIDOMNode)
   NS_INTERFACE_MAP_ENTRY(nsIDOMElement)
   NS_INTERFACE_MAP_ENTRY(nsIDOMSVGElement)

content/svg/content/src/nsSVGUseElement.h

@@ -76,6 +76,7 @@ public:
   // interfaces:
   
   NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsSVGUseElement, nsSVGUseElementBase)
   NS_DECL_NSIDOMSVGUSEELEMENT
   NS_DECL_NSIDOMSVGURIREFERENCE