Refactor: Clear m_axObjectCache when AXObject detaches

Source/modules/accessibility/AXARIAGridRow.h

Index: Source/modules/accessibility/AXARIAGridRow.h
diff --git a/Source/modules/accessibility/AXARIAGridRow.h b/Source/modules/accessibility/AXARIAGridRow.h
index bfd0b62482be6d59270ac2f873a19df133b96c2a..8e7914388a3367087a77edc1109a855a9f6b96f6 100644
--- a/Source/modules/accessibility/AXARIAGridRow.h
+++ b/Source/modules/accessibility/AXARIAGridRow.h
@@ -38,10 +38,10 @@ class AXObjectCacheImpl;
 class AXARIAGridRow final : public AXTableRow {
 
 private:
-    AXARIAGridRow(LayoutObject*, AXObjectCacheImpl*);
+    AXARIAGridRow(LayoutObject*, AXObjectCacheImpl&);
 
 public:
-    static PassRefPtr<AXARIAGridRow> create(LayoutObject*, AXObjectCacheImpl*);
+    static PassRefPtr<AXARIAGridRow> create(LayoutObject*, AXObjectCacheImpl&);
     virtual ~AXARIAGridRow();
 
     virtual void headerObjectsForRow(AccessibilityChildrenVector&) override;