ancestorForWhichThisIsAPresentationalChild shouldn't create parent AXObject

Source/modules/accessibility/AXLayoutObject.cpp

Index: Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/Source/modules/accessibility/AXLayoutObject.cpp b/Source/modules/accessibility/AXLayoutObject.cpp
index 035cedc08aba8d7f9a781657f0474b85ed540ae9..03873848d2a4e902e4657392d4db85500d6bd8e8 100644
--- a/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/Source/modules/accessibility/AXLayoutObject.cpp
@@ -1244,7 +1244,7 @@ bool AXLayoutObject::ariaRoleHasPresentationalChildren() const
 AXObject* AXLayoutObject::ancestorForWhichThisIsAPresentationalChild() const
 {
     // Walk the parent chain looking for a parent that has presentational children
-    AXObject* parent = parentObject();
+    AXObject* parent = parentObjectIfExists();
     while (parent) {
         if (parent->ariaRoleHasPresentationalChildren())
             break;