Store SVGElement instead of SVGElementInstance for instancesForElement

Source/core/svg/SVGUseElement.cpp

Index: Source/core/svg/SVGUseElement.cpp
diff --git a/Source/core/svg/SVGUseElement.cpp b/Source/core/svg/SVGUseElement.cpp
index 82701d0b4c2d78767fd02c75f80906475ed450ca..be9a9a5053b8453411c780251b72b9ef89ba8a9f 100644
--- a/Source/core/svg/SVGUseElement.cpp
+++ b/Source/core/svg/SVGUseElement.cpp
@@ -899,9 +899,9 @@ void SVGUseElement::invalidateShadowTree()
 void SVGUseElement::invalidateDependentShadowTrees()
 {
     // Recursively invalidate dependent <use> shadow trees
-    const HashSet<SVGElementInstance*>& instances = instancesForElement();
-    const HashSet<SVGElementInstance*>::const_iterator end = instances.end();
-    for (HashSet<SVGElementInstance*>::const_iterator it = instances.begin(); it != end; ++it) {
+    const HashSet<SVGElement*>& instances = instancesForElement();
+    const HashSet<SVGElement*>::const_iterator end = instances.end();
+    for (HashSet<SVGElement*>::const_iterator it = instances.begin(); it != end; ++it) {
         if (SVGUseElement* element = (*it)->correspondingUseElement()) {
             ASSERT(element->inDocument());
             element->invalidateShadowTree();