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 ecdea38ef69b5fd4692b2d62d0236f271d2b4403..0f78e7e3e26886cca11597dc806a96d0b08e11ba 100644
--- a/Source/core/svg/SVGUseElement.cpp
+++ b/Source/core/svg/SVGUseElement.cpp
@@ -867,9 +867,9 @@ 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();