Slightly upgrade caching of descendant of barren parent.

Source/modules/accessibility/AXObject.cpp

Index: Source/modules/accessibility/AXObject.cpp
diff --git a/Source/modules/accessibility/AXObject.cpp b/Source/modules/accessibility/AXObject.cpp
index d451350c269b3c73125e32f061c7b31bacc2fce0..7264084d6244957d2b491cb92e1da4e7182f268f 100644
--- a/Source/modules/accessibility/AXObject.cpp
+++ b/Source/modules/accessibility/AXObject.cpp
@@ -431,9 +431,11 @@ bool AXObject::isDescendantOfBarrenParent() const
 
 bool AXObject::computeIsDescendantOfBarrenParent() const
 {
-    for (AXObject* object = parentObject(); object; object = object->parentObject()) {
-        if (!object->canHaveChildren())
+    if (AXObject* parent = parentObject()) {
+        if (!parent->canHaveChildren())
             return true;
+
+        return parent->isDescendantOfBarrenParent();
     }
 
     return false;