Update third_party/accessibility/ax/ax_tree_update.h

Co-authored-by: Chris Bracken <chris@bracken.jp>

third_party/accessibility/ax/ax_tree_update.h

diff --git a/third_party/accessibility/ax/ax_tree_update.h b/third_party/accessibility/ax/ax_tree_update.h
index c480469..13d4fde 100644
--- a/third_party/accessibility/ax/ax_tree_update.h
+++ b/third_party/accessibility/ax/ax_tree_update.h
@@ -50,7 +50,6 @@
 //        before or after an AXTreeUpdate.
 template <typename AXNodeData, typename AXTreeData>
 struct AXTreeUpdateBase {
-  ~AXTreeUpdateBase() = default;
 
   // If |has_tree_data| is true, the value of |tree_data| should be used
   // to update the tree data, otherwise it should be ignored.