Use references some more in SVGUseElement

third_party/WebKit/Source/core/svg/SVGUseElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 71 matching lines @@
 
     LayoutObject* createLayoutObject(const ComputedStyle&) override;
 
     void scheduleShadowTreeRecreation();
     void cancelShadowTreeRecreation();
     bool haveLoadedRequiredResources() override { return !isStructurallyExternal() || m_haveFiredLoadEvent; }
 
     bool selfHasRelativeLengths() const override;
 
     // Instance tree handling
-    void buildShadowAndInstanceTree(SVGElement* target);
+    void buildShadowAndInstanceTree(SVGElement& target);
     void clearInstanceRoot();
-    void buildShadowTree(SVGElement* target, SVGElement* targetInstance, bool foundUse);
+    void buildShadowTree(SVGElement& target, SVGElement& targetInstance, bool foundUse);
     void clearShadowTree();
-    bool hasCycleUseReferencing(SVGUseElement*, ContainerNode* targetInstance, SVGElement*& newTarget);
+    bool hasCycleUseReferencing(const SVGUseElement&, const ContainerNode& targetInstance, SVGElement*& newTarget) const;
     bool expandUseElementsInShadowTree();
     void expandSymbolElementsInShadowTree();
     void cloneNonMarkupEventListeners();
 
     void invalidateDependentShadowTrees();
 
     bool resourceIsStillLoading() const;
     bool resourceIsValid() const;
     Document* externalDocument() const;
     bool instanceTreeIsLoading(const SVGElement*);
     void notifyFinished(Resource*) override;
     String debugName() const override { return "SVGUseElement"; }
     TreeScope* referencedScope() const;
     void setDocumentResource(PassRefPtrWillBeRawPtr<DocumentResource>);
 
     RefPtrWillBeMember<SVGAnimatedLength> m_x;
     RefPtrWillBeMember<SVGAnimatedLength> m_y;
     RefPtrWillBeMember<SVGAnimatedLength> m_width;
     RefPtrWillBeMember<SVGAnimatedLength> m_height;
 
     bool m_haveFiredLoadEvent;
     bool m_needsShadowTreeRecreation;
     RefPtrWillBeMember<SVGElement> m_targetElementInstance;
     RefPtrWillBeMember<DocumentResource> m_resource;
 };
 
 } // namespace blink
 
 #endif // SVGUseElement_h