Use m_targetElementInstance in fewer places

Source/core/svg/SVGUseElement.h

Index: Source/core/svg/SVGUseElement.h
diff --git a/Source/core/svg/SVGUseElement.h b/Source/core/svg/SVGUseElement.h
index 87e82a2aa4ed826467b02dc341024e9769a3ff8e..deb4157f98d5e2c789490b5966f705f196feaaf9 100644
--- a/Source/core/svg/SVGUseElement.h
+++ b/Source/core/svg/SVGUseElement.h
@@ -84,7 +84,7 @@ private:
     bool hasCycleUseReferencing(SVGUseElement*, SVGElementInstance* targetInstance, SVGElement*& newTarget);
 
     // Shadow tree handling
-    void buildShadowTree(SVGElement* target, SVGElementInstance* targetInstance);
+    void buildShadowTree(SVGElement* target, SVGElementInstance* targetInstance, ShadowRoot* shadowTreeRootElement);
 
     void expandUseElementsInShadowTree(Node* element);
     void expandSymbolElementsInShadowTree(Node* element);
@@ -94,7 +94,7 @@ private:
     SVGElementInstance* instanceForShadowTreeElement(Node* element, SVGElementInstance* instance) const;
 
     void transferUseAttributesToReplacedElement(SVGElement* from, SVGElement* to) const;
-    void transferEventListenersToShadowTree(SVGElementInstance* target);
+    void transferEventListenersToShadowTree(SVGElement* shadowTreeTargetElement);
 
     RefPtr<SVGAnimatedLength> m_x;
     RefPtr<SVGAnimatedLength> m_y;